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FTP isn't a magic number

FTP is a useful reference, not a personality trait. Here is how to retest without losing your mind, and what to actually do with the number once you have it.

May 18, 2026

FTP — functional threshold power — is the highest power you can sustain for about an hour without your legs filing a complaint with HR. It is useful. It anchors your training zones, scales TSS, and gives you something to compare to next season. It is also wildly overrated as an identity.

Why the number drifts

FTP is not a fixed constant. It moves with fitness, fatigue, sleep, stress, terrain, and whether you ate enough yesterday. A 5% swing within a week is normal. A 5% swing on the same day depending on how the test went is also normal. Treat FTP like a moving average, not a personal record.

Retesting without the drama

You do not need a 20-minute test that ruins your weekend. You have options:

  • Field test, 20 minutes. Multiply by 0.95. The classic. Works if you can pace it honestly.
  • Ramp test. 1-minute steps until failure. Easier mentally, sometimes underestimates by 5–10W.
  • Modeled from a hard effort. A 40–60 minute hard race or hard group ride often produces a better FTP estimate than a controlled test, because you actually went deep.
  • CP-based. Use a 3-min and a 12-min best from the last 6 weeks. Solves for CP. Often more stable.

Pick one. Stick with it. Compare apples to apples over time.

What to actually do with the number

  1. Set zones. Endurance (55–75% of FTP), Tempo (76–87%), Sweet Spot (88–94%), Threshold (95–105%), VO2 (106–120%), Anaerobic (120%+). That is the entire point of having an FTP.
  2. Scale workouts. A 2x20 at 95% FTP only means something if FTP is roughly accurate.
  3. Track trend, not value. Whether your FTP went from 240 to 250 matters less than whether your 5-minute and 60-minute powers also moved.

Misconceptions to drop

FTP is not your "real" maximum hour power — most athletes can ride above FTP for an hour on a good day. FTP is also not a ranking. A 4.2 W/kg FTP from a rider who rides 4 hours a week beats a 4.5 W/kg from someone who only does intervals — in the only way that matters, which is what they can do at the end of a long event.

The number is a tool. Use it. Do not worship it.

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