FTP (Functional Threshold Power) is one of the key metrics in training for cyclists and triathletes. Many people think of FTP as the maximum effort you can hold for 60 minutes — but that’s not entirely accurate. In reality, FTP is the power output (in watts) you can sustain for an hour at the highest steady effort without continual fatigue accumulation.
In other words, FTP represents your sustainable maximum — the point where it’s very hard, but still manageable.
What does “manageable” mean? Imagine doing an FTP test during a race, but you still have 30 km to go and you must not get dropped from the group. That is the essence of FTP.
Why Do You Need FTP?
FTP is the foundation for:
- defining your training zones,
- building structured training plans,
- tracking progress in endurance sports,
- pacing correctly on race day.
Most training intensities are calculated as a percentage of FTP. For example:
- Z2 (Endurance): 55–75% FTP
- Sweet Spot: 88–94% FTP
- VO₂max: 106–120% FTP
How Is FTP Measured?
Several methods exist:
60-minute all-out test
The “classic” test. Almost nobody does it because it’s brutally hard.
20-minute FTP test
Average power from 20 minutes × 0.95 = FTP.
Ramp test
Starts easy and increases power every 30–60 seconds.
FTP ≈ 75% of your final one-minute power.
Why Is FTP Important in Triathlon?
FTP directly determines:
- how fast you can ride without destroying your legs for the run,
- how to set race-day power targets,
- how to choose the right power output for Ironman / 70.3 / Olympic distance.
Typical race targets:
- Ironman bike: 65–75% FTP
- Half Ironman bike: 75–85% FTP
- Olympic distance: 90–100% FTP
For example, if an athlete has an FTP of 300 W:
- Ironman power will be 195–225 W,
- long endurance rides will sit around 165–220 W,
- VO₂max efforts exceed 315 W.