FTP and CP in Cycling: How to Set Training Intensities, and Workout Examples

A power meter turns effort into a number, but the number only becomes useful when it has meaning. Riding at 240 watts might be easy endurance for one cyclist and a race-winning effort for another. That is where FTP comes in.

FTP, or Functional Threshold Power, gives cyclists a practical anchor for training. It helps turn “ride hard” into “ride at 95 to 100% of threshold for 10 minutes”. It also gives structure to easy days, hard days, indoor sessions, and race preparation.

It is not a perfect measure of fitness. It is not the only number that matters. But used well, FTP can make training much clearer.

Power becomes useful when it is linked to a clear training benchmark.

What FTP means in cycling

FTP is commonly described as the highest average power a cyclist can sustain for one hour. In practice, it is better to think of it as a useful estimate of your threshold power, not a magic line between easy and impossible.

Around FTP, breathing is hard but controlled. The effort feels demanding from the start, then gradually more uncomfortable. You are producing a lot of lactate, but still clearing enough of it to keep going for a meaningful period.

Go slightly above this point and fatigue builds faster. Go slightly below it and the effort becomes more sustainable.

That makes FTP in cycling useful because it gives a single reference point for many types of training:

• Easy endurance rides

• Tempo work

• Sweet spot sessions

• Threshold intervals

• VO2 max efforts

• Pacing for time trials and long climbs

  
  

FTP is usually measured in watts. Riders often also compare watts per kilogram, or W/kg, because climbing performance depends heavily on power relative to body mass.

For example:

• A 75 kg rider with a 300 watt FTP has an FTP of 4.0 W/kg.

• A 60 kg rider with a 240 watt FTP also has an FTP of 4.0 W/kg.

  
  

On flat roads, absolute power matters more. On long climbs, W/kg becomes more important.

How to estimate your FTP

There are several ways to estimate FTP. None are perfect, and all depend on pacing, motivation, fatigue, equipment accuracy, and test conditions.

The 20-minute test

A common field test uses a hard 20-minute effort. After a good warm-up, the rider completes the best average power they can hold for 20 minutes. FTP is often estimated as 95% of that 20-minute average power.

Example:

• 20-minute average power is 280 watts.

• Estimated FTP is 266 watts.

  
  

This test is popular because it is simple and repeatable. The challenge is pacing. Start too hard and the final minutes collapse. Start too easy and the result underestimates fitness.

The ramp test

A ramp test starts fairly easy, then increases power every minute until the rider cannot continue. Training apps often estimate FTP from the final completed power.

Ramp tests are short and convenient, especially indoors. They can work well for tracking changes over time. The downside is that riders with strong anaerobic power may score higher than their true sustainable threshold, while diesel-style endurance riders may score lower.

Longer field efforts

Some cyclists estimate FTP from a hard 35 to 60-minute effort, such as a time trial, long climb, or solo benchmark ride. This can be closer to the original idea of FTP, but it is mentally and physically demanding.

For many riders, the best approach is simple: use one consistent test method, repeat it under similar conditions, then check whether the zones feel right in training.

Testing works best when the set-up stays consistent from one attempt to the next.

How FTP sets training intensities

Once you have an FTP estimate, you can create training zones. These zones turn percentages into practical targets.

A common seven-zone model looks like this:

Zone	Name	Typical range based on FTP	What it feels like
1	Recovery	Below 55%	Very easy spinning
2	Endurance	56 to 75%	Comfortable, conversational
3	Tempo	76 to 90%	Steady, controlled pressure
4	Threshold	91 to 105%	Hard and focused
5	VO2 max	106 to 120%	Very hard, breathing heavy
6	Anaerobic	121 to 150%	Short, severe efforts
7	Neuromuscular	Maximal	Sprints and jumps

These ranges are guides, not laws. Day-to-day performance changes with sleep, stress, heat, fuel, and fatigue. A good session should match the purpose of the workout, not just the number on the screen.

If your FTP is 250 watts, the zones would look roughly like this:

Training aim	Power target
Easy recovery	Below 138 watts
Endurance	140 to 188 watts
Tempo	190 to 225 watts
Threshold	228 to 263 watts
VO2 max	265 to 300 watts

Using power rather than heart rate is useful because it responds immediately. Heart rate lags behind effort, especially during short intervals. Rate of perceived exertion, or RPE, adds context. The best riders learn to use all three:

• Power tells you the external work.

• Heart rate shows the internal response.

• RPE tells you how the effort feels.

  
  

If a normal endurance ride feels unusually hard and heart rate is higher than expected, the body may be carrying fatigue. If threshold power feels smooth and controlled, fitness may be improving.

Workout examples using FTP

Good workouts have a purpose. The numbers should serve that purpose, not turn every ride into a test.

Endurance ride

This develops aerobic fitness and durability.

Session

• 90 minutes to 3 hours

• Ride mostly at 60 to 75% of FTP

• Keep cadence comfortable

• Avoid surges on climbs if possible

  
  

For a rider with a 250 watt FTP, this means about 150 to 188 watts.

This session should feel controlled. You should finish tired from duration, not destroyed by intensity.

Tempo blocks

Tempo work builds steady muscular endurance. It is useful for sportives, rolling roads, group rides, and long climbs.

Session

• Warm up for 15 minutes

• Ride 3 × 15 minutes at 80 to 88% of FTP

• Recover for 5 minutes easy between blocks

• Cool down for 10 minutes

  
  

For a 250 watt FTP, the work intervals sit around 200 to 220 watts.

Tempo should feel purposeful but not frantic. Breathing rises, but you should remain in control.

Sweet spot intervals

Sweet spot usually sits around 88 to 94% of FTP. It gives a strong training stimulus without the same fatigue cost as riding right at threshold.

Session

• Warm up for 15 to 20 minutes

• Ride 3 × 12 minutes at 88 to 94% of FTP

• Recover for 5 minutes easy between intervals

• Cool down

  
  

For a 250 watt FTP, the target is about 220 to 235 watts.

A progression might move from 3 × 12 minutes to 3 × 15 minutes, then 2 × 25 minutes over several weeks.

Threshold intervals

Threshold work trains the ability to sustain hard efforts near FTP. It is specific for time trials, long climbs, breakaways, and race-winning sustained moves.

Session

• Warm up well

• Ride 4 × 8 minutes at 95 to 100% of FTP

• Recover for 4 minutes easy

• Cool down

  
  

For a 250 watt FTP, aim for 238 to 250 watts.

This should feel hard but repeatable. If the first interval needs a maximal effort, the target is too high.

VO2 max intervals

VO2 max sessions use power above FTP to stress the oxygen delivery system. These efforts are short, sharp, and uncomfortable.

Session

• Warm up for 20 minutes

• Ride 5 × 4 minutes at 110 to 115% of FTP

• Recover for 4 minutes easy between efforts

• Cool down

  
  

For a 250 watt FTP, the target is about 275 to 288 watts.

The final minute of each interval should be hard. The session works best when all reps are completed with similar quality.

Anaerobic capacity efforts

These target short power above threshold. They are useful for attacks, steep ramps, sprint lead-ins, cyclo-cross, track riding, and repeated surges.

Session

• Warm up fully

• Ride 2 sets of 6 × 30 seconds hard at 130 to 150% of FTP

• Recover for 2 minutes easy between reps

• Recover for 8 minutes between sets

• Cool down

  
  

For a 250 watt FTP, the work range is about 325 to 375 watts.

These efforts are not meant to feel smooth. They are meant to be forceful and short.

Intervals become easier to pace when each effort has a clear power target.

How to use FTP without becoming trapped by it

FTP is useful, but it should not dominate every ride.

A rider with a 250 watt FTP might complete threshold intervals at 250 watts indoors on Tuesday, then struggle to hold the same number outdoors on a hot Sunday after poor sleep. That does not mean fitness vanished. It means performance is affected by context.

Several factors can change the power you can produce on a given day:

• Heat and humidity

• Fatigue from previous training

• Poor fuelling

• Dehydration

• Lack of sleep

• Stress

• Altitude

• Illness

• Indoor cooling

• Bike position

• Calibration differences between power meters

  
  

FTP also changes with training. If workouts start feeling too easy, it may be time to retest or adjust. If every threshold session becomes a survival mission, the FTP setting may be too high.

A practical rule is to review FTP every 4 to 8 weeks during structured training, or after a clear change in fitness. Testing too often can turn training into constant trial by ordeal.

What critical power means

Critical Power, often shortened to CP, is another way to describe sustainable power. It comes from the relationship between power output and how long that power can be held.

In simple terms, CP is the power level that separates heavy but sustainable work from severe work that draws down a limited reserve.

That reserve is often called W prime, written as `W′`. It represents a finite amount of work a rider can do above Critical Power.

A simple way to picture it:

• Ride below CP and the effort can continue for a long time, assuming fuel, hydration, and comfort hold up.

• Ride above CP and you start spending W′.

• Once W′ is gone, you have to slow down or stop producing that power.

  
  

Critical Power is usually estimated from several hard efforts of different durations, such as 3, 5, 12, and 20 minutes. Software can model the power-duration curve and estimate CP and W′.

FTP and CP often sit in a similar range, but they are not identical. FTP is a practical coaching benchmark. CP is a mathematical model based on the power-duration relationship.

For many riders, both can be useful. FTP makes everyday training simple. CP helps explain why a rider may be strong in short surges but less impressive in long threshold efforts, or the other way round.

What affects Critical Power

Critical Power is shaped by several parts of cycling fitness.

Aerobic fitness

A strong aerobic system supports a higher CP. This comes from consistent endurance training, threshold work, and enough recovery to adapt.

Riders with a high CP can often sit at a hard steady pace for a long time. They may not have the biggest sprint, but they can make life difficult by holding pressure.

Anaerobic capacity

W′ affects how much work a rider can do above CP. A rider with a large W′ may handle repeated attacks, short climbs, and punchy race efforts well.

That same rider might also overperform in a ramp test or short FTP test because they can use anaerobic power to push through the final minutes.

Fatigue and recovery

CP is not fixed from day to day. Heavy training can reduce the power a rider can sustain, even if fitness is improving over the longer term.

A tired rider may see lower CP estimates because hard test efforts are compromised. Freshness matters when testing.

Fuelling and hydration

Carbohydrate availability affects hard efforts. Low glycogen can make threshold and VO2 work feel much harder. Dehydration can raise strain and reduce performance, especially in warm conditions.

For demanding sessions, eating enough before and during the ride often makes the target power more achievable.

Environment and equipment

Heat, poor airflow indoors, altitude, tyres, drivetrain condition, and power meter differences can all affect measured output.

This is one reason consistency matters. If you test indoors with a direct-drive trainer, then train outdoors with a different power meter, small differences may appear.

Bike position also matters. A very aerodynamic position may reduce the power some riders can produce, even if it makes them faster on the road.

Critical power and FTP both respond to recovery, fuelling, and the conditions around the ride.

How FTP and Critical Power fit together

FTP and Critical Power both help describe performance, but they serve slightly different roles.

Measure	Best use	Main limitation
FTP	Setting simple training zones and pacing steady efforts	Can be skewed by test type and anaerobic strength
Critical Power	Understanding the power-duration curve and work above threshold	Needs several good maximal efforts to estimate well
W′	Explaining repeatability above CP	Hard to track in real time without good data

For most cyclists, FTP is the easier starting point. Test it, set zones, train consistently, then adjust based on how sessions feel.

Critical Power becomes especially useful for riders who want more detail. It helps explain why two cyclists with the same FTP can race very differently. One may handle repeated surges. Another may be better at sitting just below threshold for a long climb.

Neither number replaces good judgement. Training still needs easy rides, progressive overload, recovery, sleep, food, and patience.

The main takeaway

FTP gives structure to cycling training. It lets you prescribe effort with more precision than feel alone, whether the goal is endurance, sweet spot, threshold, VO2 max, or anaerobic work.

Critical Power adds another layer. It shows how long different power outputs can be sustained and how work above threshold draws from a limited reserve.

Use the numbers as tools, not verdicts. Test consistently, set sensible zones, listen to how the body responds, and let the data guide training rather than control it.