12-Week Intermediate Road Cycling Training Plan for 100 Miles

Q: What FTP do I need to complete a 100-mile ride?

There is no minimum FTP for a century. What matters is your power-to-weight ratio and your ability to sustain a comfortable pace for 5-7 hours. Riders with an FTP of 180w complete centuries regularly. The plan teaches you to pace at 76-85% of whatever your FTP is.

Q: How is this plan different from the beginner 100-mile plan?

The beginner plan uses RPE (perceived effort) and requires no devices. This intermediate plan uses power zones and heart rate zones for precise intensity control. It also includes sweet spot and threshold intervals that the beginner plan does not. The weekly volume is higher (8h vs 5h) and assumes you already have an aerobic base.

Q: Should I retest my FTP during the plan?

Yes. Test before starting the plan and again after week 8 (recovery week). If your FTP has increased, update your zones for the peak phase. Training with outdated zones means every interval is calibrated to the wrong intensity.

Q: Can I do this plan on an indoor trainer?

Yes, but do at least 2-3 long rides outdoors in the build and peak phases. Indoor training is excellent for interval precision but does not prepare you for the sustained posture, road vibration, nutrition logistics, and mental demands of 5-7 hours on the road.

Q: How many calories should I eat per hour during the century?

Aim for 60-90 grams of carbohydrates per hour, which translates to approximately 240-360 calories from carbs. Start at 60g/hour and increase as your gut tolerance allows during training. Most experienced century riders settle around 70-80g per hour.

Q: What pace should I target for a 100-mile ride?

Target 76-85% of your FTP for the majority of the ride. The exact wattage depends on your individual FTP. This typically results in a comfortable, sustainable pace you can hold for 5-7 hours. Focus on percentage of FTP, not absolute watts or speed.

This 12-week plan prepares intermediate road cyclists for a 100-mile century ride using power and heart rate zones. It assumes you have a power meter and heart rate monitor, and that you are already riding regularly with a solid aerobic base. The plan progresses through structured intervals, long ride builds, and targeted nutrition practice to get you to the start line confident and ready.

IntermediateRoad100 Miles

This plan assumes

Effort system Power zones (% FTP) + HR zones (% max HR)

Weekly hours 8h

Rides per week 5

Are you ready for this plan?

Can ride continuously for 2 hours at a comfortable pace
Have a power meter and heart rate monitor
Know your current FTP (tested within the last 6 weeks)
Can commit to 5 rides per week for 12 weeks

If you cannot ride for 2 hours comfortably or do not have a power meter, start with a beginner plan that uses RPE to guide effort. Start here instead.

Plan overview

Base Weeks 1-4

Rebuild and solidify your aerobic base with sustained Zone 2 efforts. Long rides grow progressively and weekday rides introduce tempo blocks to raise your aerobic ceiling.

6-8 hours/week

Build Weeks 5-9

Introduce sweet spot and threshold intervals to raise FTP. Long rides extend to 4+ hours with sections at century pace. Back-to-back weekend rides simulate race-week fatigue.

8-10 hours/week

Peak Weeks 10-11

Highest quality sessions with race simulations and pacing rehearsals. Volume begins to taper but intensity stays high. Your longest ride approaches target distance.

8-9 hours/week

Taper Weeks 12

Reduce volume by 40-50% while keeping two short, sharp sessions. Focus on sleep, nutrition prep, and equipment checks. You should feel restless by race day.

4-5 hours/week

Weekly structure

Mon Rest

Tue Intervals

Wed Easy endurance

Thu Threshold / Sweet spot

Fri Rest

Sat Long ride

Sun Recovery ride

Training zones

This plan uses power zones (% of FTP) and heart rate zones (% of max HR) to guide effort. A power meter and heart rate monitor are required.

Power zones

Zone	% FTP	RPE	Feel
Z1 Recovery	0-55% FTP	1-2 out of 10	Extremely easy. No sensation of effort. Used only for recovery rides.
Z2 Endurance	56-75% FTP	3-4 out of 10	Comfortable, sustainable effort. You are working but could maintain this for hours.
Z3 Tempo	76-90% FTP	5-6 out of 10	Moderately hard. Sustainable for 30-60 minutes but requires concentration.
Z4 Threshold	91-105% FTP	7-8 out of 10	Hard. You can sustain this for 20-40 minutes with focus. Speaking is difficult.
Z5 VO2max	106-120% FTP	8-9 out of 10	Very hard. Maximum sustainable effort for 3-8 minutes. Legs and lungs burn.
Z6 Anaerobic Capacity	121-150% FTP	9-10 out of 10	Maximum effort for 30 seconds to 2 minutes. Not sustainable.
Z7 Neuromuscular Power	150%+ FTP	10 out of 10	All-out sprint for under 30 seconds. Pure explosive effort.

Heart rate zones

Zone	% Max HR	Feel
Z1 Recovery	0-59% max HR	Extremely easy. No sensation of effort. Used only for recovery rides.
Z2 Endurance	60-70% max HR	Comfortable, sustainable effort. You are working but could maintain this for hours.
Z3 Tempo	71-80% max HR	Moderately hard. Sustainable for 30-60 minutes but requires concentration.
Z4 Threshold	81-90% max HR	Hard. You can sustain this for 20-40 minutes with focus. Speaking is difficult.
Z5 VO2max	91-100% max HR	Very hard. Maximum sustainable effort for 3-8 minutes. Legs and lungs burn.

12-week training plan

5 rides per week building from 6h in week 1 to a peak of 10h before tapering. All sessions use power zones (% FTP) with heart rate as a secondary reference.

Day	Session	Duration
WEEK 1
Mon	Rest	-
Tue	Endurance + 3x8min tempo @ 76-90% FTP / 71-80% HR	75 min
Wed	Easy endurance @ 56-75% FTP / 60-70% HR	60 min
Thu	Endurance + 2x10min tempo @ 76-90% FTP / 71-80% HR	75 min
Fri	Rest	-
Sat	Long endurance @ 56-75% FTP / 60-70% HR	2h 30min
Sun	Recovery @ 0-55% FTP / 0-59% HR	45 min
WEEK 2
Mon	Rest	-
Tue	Endurance + 3x10min tempo @ 76-90% FTP / 71-80% HR	80 min
Wed	Easy endurance @ 56-75% FTP / 60-70% HR	60 min
Thu	Endurance + 2x12min tempo @ 76-90% FTP / 71-80% HR	80 min
Fri	Rest	-
Sat	Long endurance @ 56-75% FTP / 60-70% HR	2h 45min
Sun	Recovery @ 0-55% FTP / 0-59% HR	45 min
WEEK 3
Mon	Rest	-
Tue	Endurance + 3x10min tempo @ 76-90% FTP / 71-80% HR	80 min
Wed	Easy endurance @ 56-75% FTP / 60-70% HR	60 min
Thu	Endurance + 2x15min tempo @ 76-90% FTP / 71-80% HR	85 min
Fri	Rest	-
Sat	Long endurance @ 56-75% FTP / 60-70% HR	3h
Sun	Recovery @ 0-55% FTP / 0-59% HR	50 min
WEEK 4
Mon	Rest	-
Tue	Endurance + 2x15min tempo @ 76-90% FTP / 71-80% HR	80 min
Wed	Easy endurance @ 56-75% FTP / 60-70% HR	60 min
Thu	Endurance + 2x12min sweet spot @ 88-93% FTP / 71-80% HR	80 min
Fri	Rest	-
Sat	Long endurance + tempo finish @ 76-90% FTP / 71-80% HR	3h 15min
Sun	Recovery @ 0-55% FTP / 0-59% HR	50 min
WEEK 5
Mon	Rest	-
Tue	Endurance + 2x15min sweet spot @ 88-93% FTP / 71-80% HR	85 min
Wed	Easy endurance @ 56-75% FTP / 60-70% HR	60 min
Thu	Endurance + 2x15min threshold @ 91-105% FTP / 81-90% HR	85 min
Fri	Rest	-
Sat	Long endurance @ 56-75% FTP / 60-70% HR	3h 30min
Sun	Recovery @ 0-55% FTP / 0-59% HR	50 min
WEEK 6
Mon	Rest	-
Tue	Endurance + 3x12min sweet spot @ 88-93% FTP / 71-80% HR	90 min
Wed	Easy endurance @ 56-75% FTP / 60-70% HR	60 min
Thu	Endurance + 2x20min threshold @ 91-105% FTP / 81-90% HR	90 min
Fri	Rest	-
Sat	Long endurance + century pace sections @ 76-85% FTP / 71-80% HR	3h 45min
Sun	Recovery @ 0-55% FTP / 0-59% HR	55 min
WEEK 7
Mon	Rest	-
Tue	Endurance + 3x15min sweet spot @ 88-93% FTP / 71-80% HR	90 min
Wed	Easy endurance @ 56-75% FTP / 60-70% HR	60 min
Thu	Endurance + 2x20min threshold @ 91-105% FTP / 81-90% HR	90 min
Fri	Rest	-
Sat	Long endurance @ 56-75% FTP / 60-70% HR	4h
Sun	Recovery @ 0-55% FTP / 0-59% HR	55 min
WEEK 8
Mon	Rest	-
Tue	Recovery week: easy endurance @ 56-75% FTP / 60-70% HR	60 min
Wed	Rest	-
Thu	Endurance + 2x10min tempo @ 76-90% FTP / 71-80% HR	70 min
Fri	Rest	-
Sat	Long endurance @ 56-75% FTP / 60-70% HR	2h 30min
Sun	Recovery @ 0-55% FTP / 0-59% HR	40 min
WEEK 9
Mon	Rest	-
Tue	Endurance + 3x15min sweet spot @ 88-93% FTP / 71-80% HR	90 min
Wed	Easy endurance @ 56-75% FTP / 60-70% HR	60 min
Thu	Endurance + 2x20min threshold @ 91-105% FTP / 81-90% HR	90 min
Fri	Rest	-
Sat	Long endurance + century pace @ 76-85% FTP / 71-80% HR	4h 15min
Sun	Recovery @ 0-55% FTP / 0-59% HR	55 min
WEEK 10
Mon	Rest	-
Tue	Endurance + 2x20min sweet spot @ 88-93% FTP / 71-80% HR	90 min
Wed	Easy endurance @ 56-75% FTP / 60-70% HR	60 min
Thu	Race simulation: 2x30min @ 76-85% FTP / 71-80% HR	90 min
Fri	Rest	-
Sat	Long endurance @ 56-75% FTP / 60-70% HR	4h 30min
Sun	Recovery @ 0-55% FTP / 0-59% HR	55 min
WEEK 11
Mon	Rest	-
Tue	Endurance + 2x15min threshold @ 91-105% FTP / 81-90% HR	80 min
Wed	Easy endurance @ 56-75% FTP / 60-70% HR	50 min
Thu	Endurance + 2x10min sweet spot @ 88-93% FTP / 71-80% HR	75 min
Fri	Rest	-
Sat	Long endurance + pace rehearsal @ 76-85% FTP / 71-80% HR	3h 30min
Sun	Recovery @ 0-55% FTP / 0-59% HR	45 min
WEEK 12
Mon	Rest	-
Tue	Easy endurance + 2x8min tempo @ 76-90% FTP / 71-80% HR	55 min
Wed	Rest	-
Thu	Activation: 2x5min @ 91-105% FTP / 81-90% HR	45 min
Fri	Rest	-
Sat	Century Ride Day	5-7h
Sun	Rest	-

📥 Download free 12-week plan (PDF)

This plan is not personalized for you

This plan uses Power zones (% FTP) and HR zones (% max HR) effort guidance and assumes 8h/week of available training time. Here is what a generic plan cannot account for:

All power targets are expressed as percentages of your FTP. If you have not tested your FTP recently, every interval target may be too easy or too hard for your actual fitness level. Test before starting the plan.
Weekly volume is fixed at 8 hours, but your real available time changes week to week. This plan cannot adjust when your schedule shifts.
The recovery week is fixed at week 8 regardless of how your body is actually responding. You may need recovery sooner or later depending on your fatigue accumulation.
If you miss a session, the plan does not recalibrate. You either fall behind or skip ahead, and both compromise the training progression.
There is no feedback loop. This plan does not read your power data, sleep quality, or HRV to adjust intensity. An AI coach does this automatically every week.

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Week-by-week breakdown

Week 1 Base 🕐 6h 15min

Aerobic foundation

Focus: Establish the 5-ride weekly structure and build long ride duration to 2h 30min.

Key session: Saturday long ride: 2h 30min at Zone 2 (56-75% FTP). Stay disciplined on power, no surges.

What to feel: Every ride should feel controlled and comfortable. If you finish exhausted, you rode too hard.

Avoid: Pushing tempo efforts above 90% FTP. Tempo means 76-90%, not threshold.

Week 2 Base 🕐 6h 45min

Tempo introduction

Focus: Extend tempo blocks to 10 minutes and grow the long ride to 2h 45min.

Key session: Tuesday: 3x10min tempo at 76-90% FTP with 5 min recovery between. Steady power, no spikes.

What to feel: Tempo should feel moderately hard but sustainable. You should be able to hold it for the full duration without fading.

Avoid: Starting tempo intervals too hard and fading. Aim for the same power in the last interval as the first.

Week 3 Base 🕐 7h 15min

Tempo extension

Focus: Lengthen tempo blocks to 15 minutes. Long ride reaches 3 hours.

Key session: Saturday long ride: 3 hours at Zone 2. Practice eating every 30 minutes from the start.

What to feel: The 3-hour ride should feel like a solid effort but not depleting. If you bonk, your nutrition strategy needs work.

Avoid: Waiting until you feel hungry to eat. On a century, you need to eat from the first 30 minutes.

Week 4 Base 🕐 7h 30min

Sweet spot introduction

Focus: First sweet spot intervals at 88-93% FTP. Long ride includes a tempo finish.

Key session: Thursday: 2x12min sweet spot at 88-93% FTP. This is the upper end of what feels sustainable. Breathing is heavy but controlled.

What to feel: Sweet spot should feel like the hardest effort you could sustain for 30 minutes. Not all-out, but genuinely hard.

Avoid: Confusing sweet spot with threshold. Sweet spot is 88-93% FTP, not 95-105%.

Week 5 Build 🕐 8h 15min

Threshold work begins

Focus: First threshold intervals at 91-105% FTP. Sweet spot blocks extend to 15 minutes.

Key session: Thursday: 2x15min threshold at 91-105% FTP. This is your FTP ceiling, the hardest sustained effort the plan asks for.

What to feel: Threshold should feel hard. Speaking is difficult. You can sustain this for 20-40 minutes but it requires full concentration.

Avoid: Going above 105% FTP during threshold intervals. That crosses into VO2max territory and changes the adaptation.

Week 6 Build 🕐 9h

Century pace practice

Focus: Saturday long ride includes sections at century pace (76-85% FTP). Threshold intervals extend to 20 minutes.

Key session: Saturday: 3h 45min with 3x15min at century pace (76-85% FTP). This teaches your body to hold a steady effort for hours.

What to feel: Century pace should feel like controlled tempo. Sustainable for the full distance if nutrition is on point.

Avoid: Riding century pace sections above 85% FTP. That is threshold, not century pace. You will bonk before mile 70.

Week 7 Build 🕐 9h 30min

Volume peak

Focus: Highest volume week. Long ride hits 4 hours. Sweet spot and threshold sessions at their longest.

Key session: Saturday long ride: 4 hours at Zone 2. Simulate race conditions: eat what you plan to eat on race day, drink the same amounts.

What to feel: Tired by Thursday but capable by Saturday. The 4-hour ride should be hard but not devastating.

Avoid: Trying to ride the full 100 miles in training. The peak ride is 4 hours, not 5-7. The taper and adrenaline cover the gap.

Week 8 Build 🕐 5h 40min

Recovery week

Focus: Reduce volume by 40%. Easy rides only with a short tempo session Thursday. Let your body absorb 7 weeks of training.

Key session: Thursday: easy ride with 2x10min tempo. Just enough to stay sharp without adding fatigue.

What to feel: Fresh, motivated, and slightly restless by Saturday. If you still feel tired, take an extra rest day.

Avoid: Panicking about losing fitness during recovery week. You are not losing fitness. You are absorbing it.

Week 9 Build 🕐 9h 30min

Final build

Focus: Return to high volume with the longest sweet spot and threshold blocks. Saturday long ride reaches 4h 15min with century pace sections.

Key session: Saturday: 4h 15min with 4x15min at century pace. This is your dress rehearsal for the distance.

What to feel: Strong and confident. The century pace sections should feel controlled and repeatable.

Avoid: Going harder than century pace because you feel strong after recovery week. Save the extra energy for race day.

Week 10 Peak 🕐 8h 45min

Race simulation

Focus: Race simulation session: 2x30min at century pace. Long ride reaches 4h 30min, the longest of the plan.

Key session: Thursday: race simulation, 2x30min at 76-85% FTP with 10min recovery. Hold perfectly even power.

What to feel: The race simulation should feel hard but doable. If you can hold power for both 30-minute blocks, you are ready.

Avoid: Treating the race simulation as a time trial. It is a pacing exercise, not a max effort.

Week 11 Peak 🕐 7h 30min

Sharpening

Focus: Volume starts to drop but intensity stays. Shorter threshold intervals keep the engine sharp. Long ride reduces to 3h 30min with pace rehearsal.

Key session: Saturday: 3h 30min with the last 45min at century pace. Your final long effort before race week.

What to feel: Sharp, fast, and efficient. Rides feel easier at the same power. This means the taper is working.

Avoid: Adding extra intensity because you feel good. The taper makes you feel strong. Channel that energy into race day, not extra training.

Week 12 Taper 🕐 ~5h (including race)

Race week

Focus: Two short rides to stay loose. Tuesday easy tempo, Thursday activation. Saturday is race day.

Key session: Saturday: Century ride day. Start at Zone 2, build to century pace by mile 20, eat every 30 minutes, and enjoy the ride.

What to feel: Restless, eager, and slightly nervous. If you feel like you are losing fitness, that is the taper talking. Trust the 11 weeks of work behind you.

Avoid: Going out too fast in the first 20 miles. Century pacing is everything. Start conservative, finish strong.

Fueling your training

Century nutrition is not optional. At intermediate intensity, you burn 600-900 calories per hour and your glycogen stores last approximately 90 minutes. Without a fueling strategy, you will bonk.

🍌 Before rides

Eat a carb-rich meal 3 hours before longer rides. Aim for 100-150g of carbohydrates: rice, oatmeal, toast with honey, or pasta. For early morning rides, a smaller meal of 60-80g carbs 90 minutes before is sufficient. Avoid high-fat and high-fiber foods that slow digestion.

⚡ During rides

For rides under 90 minutes, water and electrolytes are sufficient. For rides over 90 minutes, aim for 60-90 grams of carbohydrates per hour from gels, bars, chews, or real food like rice cakes and dates. Start eating at minute 20, not when you feel hungry. Practice your race-day nutrition on every long ride.

🥛 After rides

Within 30 minutes of finishing, consume 1.2g of carbohydrates per kilogram of body weight plus 20-30g of protein. Good options: recovery shake, rice with chicken, chocolate milk, or yogurt with granola and fruit. This window is critical for glycogen replenishment.

💧 Hydration

Drink 500-750ml per hour depending on temperature and sweat rate. Use electrolyte mix in your bottles, not plain water, for rides over 90 minutes. Weigh yourself before and after long rides to calibrate your personal sweat rate. Every kilogram lost is roughly one liter of fluid deficit.

🏁 Race day

Eat your pre-ride meal 3 hours before start. Carry enough nutrition for the full century: plan for 5-7 hours and budget 60-90g carbs per hour. Know where the aid stations are and what they serve. Carry backup nutrition in case aid stations are sparse. Never try new food on race day.

Gear checklist

Essential

Power meter Essential for pacing a century. Without power data, you are guessing your effort and risk blowing up after 60 miles.

Heart rate monitor (chest strap) Secondary effort reference and cardiac drift detection on long rides. Chest straps are more accurate than wrist sensors during high-intensity intervals.

Properly fitted road bike A professional bike fit is critical for 5-7 hours in the saddle. Poor fit causes knee, back, and neck issues that compound with distance.

Padded cycling bib shorts Bib shorts eliminate waistband pressure on long rides. Invest in quality chamois padding for century distances.

Two water bottles and cages (or hydration system) You need 500-750ml per hour for 5-7 hours. Two large bottles with a plan for refills at aid stations.

Nice to have

Cycling computer with mapping Displays real-time power, heart rate, distance, and route navigation. Critical for pacing and knowing what is ahead.

Saddle bag with spare tube, CO2, and multi-tool A mechanical issue 50 miles from the finish with no support vehicle ends your day. Be self-sufficient.

Aero helmet or aero socks Small aerodynamic gains add up over 100 miles. An aero helmet saves 30-60 seconds per hour at century pace.

5 mistakes that derail intermediate plans

Going out too fast in the first 20 miles

Century pacing is about negative splitting. If your average power in the first hour exceeds your plan, you will pay for it after mile 60. The adrenaline of race day makes the first miles feel effortless.

✅ Fix: Set a power ceiling for the first 30 minutes: stay at or below 75% FTP regardless of how easy it feels.

Not practicing nutrition during training

Your race-day nutrition strategy should be rehearsed on every long ride over 3 hours. Gut tolerance is a trainable skill that takes weeks to develop.

✅ Fix: Eat the same foods, at the same intervals, on every long training ride. By race day, your stomach should handle 60-90g carbs per hour without issues.

Training at sweet spot or threshold on easy days

Easy endurance rides are Zone 2 (56-75% FTP), not 80% FTP. Riding too hard on recovery days accumulates fatigue and compromises your next interval session.

✅ Fix: Cap your power at 75% FTP on all easy and recovery rides. If you cannot stay below 75%, your FTP may need retesting.

Skipping the recovery week

Week 8 is a recovery week for a reason. Skipping it means arriving at the peak phase already fatigued, which defeats the purpose of the entire build block.

✅ Fix: Follow the recovery week exactly as written. You will come out of it stronger and sharper for the final build.

Not knowing the course profile

A flat century and a hilly century require completely different pacing strategies. If your race has 5,000 feet of climbing, you need to account for that in your power targets.

✅ Fix: Study the course profile weeks before the race. Adjust your power targets for climbs (allow 5-10% above century pace on hills, compensate on flats).

Ride day tips

Pace by power, not by feel or speed

Set your cycling computer to display 3-second average power and stay within your century pace range (76-85% FTP) for the first two thirds of the race. Speed is irrelevant; it changes with wind, terrain, and drafting. Power is the only constant.

Eat early and eat often

Start eating at minute 20. Set a timer on your cycling computer for every 20 minutes as a reminder. By the time you feel hungry on a century, you are already 20-30 minutes behind on fuel and catching up is nearly impossible.

Use the draft whenever possible

Drafting behind other riders saves 20-30% of your energy. In a century event, sit in a group when you can. The energy savings over 100 miles are equivalent to riding 70-80 miles solo. This is free speed.

Break the race into segments mentally

Do not think about 100 miles. Think about the next aid station, the next 10 miles, the next climb. Mental fatigue is real on a century and chunking the distance into manageable pieces keeps your head in the ride.

Why a personalized plan outperforms this one

This plan provides a solid framework for century preparation. But a plan built from your actual power data, recovery metrics, and weekly schedule adapts to you instead of asking you to adapt to it.

Aspect	This plan	Personalized plan
Power targets	All intervals based on generic % FTP ranges. Without a recent FTP test, targets may not match your actual fitness.	✓ Intervals calibrated to your tested FTP, updated after every test and performance breakthrough.
Weekly volume	Fixed at 8 hours per week for every rider.	✓ Adjusted to your real available hours, which can change week to week based on life and work.
Recovery timing	Recovery week fixed at week 8 regardless of fatigue.	✓ Reads your HRV, sleep quality, and training load to prescribe recovery when your body needs it.
Missed sessions	Plan does not adjust. You fall behind or skip ahead.	✓ Plan recalibrates the following week based on what you actually completed.
Race-specific preparation	Generic century pacing for a flat course.	✓ Adjusts interval profiles and long ride structure based on your specific race course profile.