FTP Test and Power Training: Cycling Zones Explained

No training metric has changed cycling as profoundly as measuring power in watts. While heart rate drifts — with heat, caffeine, sleep and daily form — the power meter delivers the naked truth: how much output you are actually pushing through the pedals right now. The anchor of the whole system is FTP, your functional threshold power. Once you know it, you can define your training zones precisely, control intervals exactly and measure progress objectively. Here you will learn what FTP is physiologically, how to determine it reliably with three test protocols, how the seven power zones are derived from it — and which mistakes in power-based training most often cost time and form.

What is FTP — and why is it the anchor?

Functional Threshold Power is defined as the highest average power you can sustain for one hour. Physiologically, it sits close to the maximal lactate steady state: the highest workload at which lactate production and clearance are still in balance. Ride above FTP and lactate accumulates, ending the effort within minutes; ride below it and you can pedal for hours. FTP therefore marks the border between sustainable and unsustainable output — exactly the threshold around which almost all structured cycling training is organized.

Three reasons make FTP a better steering metric than heart rate: first, watts respond without delay — at the start of an interval the reading jumps instantly, while heart rate needs a minute or two to catch up. Second, watts are objective: 250 watts are 250 watts, whether at 15 or 35 degrees. Third, everything scales from it: zones, training load, intensity distribution. The Training Stress Score, which Peakora uses to quantify your cycling load, is calculated directly from the ratio of your ridden power to FTP — without a correct FTP value, load management is wrong too.

FTP test: the three protocols compared

A true 60-minute all-out effort is the cleanest physiological measurement but practically almost impossible — pacing a full hour at the limit is a skill only experienced time trialists have. That is why three shorter protocols have become established, all extrapolating to the same number:

• 20-minute test (the classic): After a 20-minute warm-up with two short activations, you ride 20 minutes as hard and evenly as possible. FTP = 95 percent of the average power. The 0.95 factor corrects for the fact that almost nobody sustains their true hour power for 20 minutes. Key point: start steadily — blow the first five minutes and you fade late, measuring too low.
• Ramp test: After the warm-up, target power rises by 20 to 25 watts every minute until you can no longer hold it. FTP = 75 percent of the last fully completed minute. Advantage: no pacing required, short total duration, ideal on a smart trainer in ERG mode. Drawback: the conversion factor fits very diesel-type riders poorly — their ramp FTP tends to come out too high.
• Two-by-8-minute test: Two eight-minute all-out intervals with ten minutes of recovery, FTP = 90 percent of the better average. Well suited to riders with high sprint and short-duration power who would systematically over-test in a 20-minute protocol.

Whatever the protocol, test conditions stay the same: rested — ideally after a recovery week — fasted or at least two hours after the last meal, same position, same course or same trainer, no caffeine experiments on test day. Only consistent conditions make values from different months comparable.

From FTP to the seven power zones

The measured FTP becomes the base of the seven-zone model popularized by Coggan — the de facto standard of power-based training. For an FTP of 250 watts, the breakdown looks like this:

• Zone 1 — Active recovery (under 55% of FTP): below 138 watts. Easy spins the day after hard sessions. Feels like "way too slow" — and is exactly right.
• Zone 2 — Endurance (56–75%): 140 to 188 watts. The domain of long rides: fat metabolism, capillarization, aerobic capacity. The bulk of total volume belongs here — the 80/20 principle applies on the bike just as it does in running.
• Zone 3 — Tempo (76–90%): 190 to 225 watts. The "grey zone": too hard for real recovery, too easy for maximum stimulus. Useful deliberately, for example at gran-fondo-specific pace — but no place to live permanently.
• Zone 4 — Threshold (91–105%): 228 to 263 watts. Training right at FTP — the classic 2x20-minute intervals. High impact, high cost: no more than two threshold sessions per week.
• Zone 5 — VO2max (106–120%): 265 to 300 watts. Three-to-eight-minute intervals targeting maximal oxygen uptake — the counterpart to VO2max training in running.
• Zone 6 — Anaerobic capacity (121–150%): 300 to 375 watts. Thirty seconds to two minutes, criterium and hill-finish work.
• Zone 7 — Sprint (above 150%): anything beyond, seconds range, neuromuscular power.

If you also train by pulse, do not map the power zones one-to-one onto heart rate zones — the models have different logic and different boundaries.

Power training in practice: three effective workouts

The biggest practical benefit of power measurement: intervals become precisely dosable and repeatable. Three workouts form the backbone of most weeks:

• Sweet spot (88–94% of FTP): 2x20 minutes or 3x15 minutes just below threshold. The highest training stimulus per unit of fatigue — the most efficient building block for FTP growth when training time is limited.
• Threshold intervals (95–100%): 2x20 minutes at FTP with five minutes of recovery. Directly raises the lactate steady state — more demanding than sweet spot, once per week at most.
• VO2max blocks (110–120%): 5x4 minutes with four minutes of recovery. The key to lifting the ceiling — without a high VO2max, FTP stays capped in the long run.

Outdoors, find a long, steady climb or a quiet bike path for threshold and VO2max work — traffic lights and descents ruin any interval. Indoors, the smart trainer's ERG mode handles the dosing completely: the device holds the target watts, you simply pedal. Especially in winter, this creates the most precise form of indoor trainer training.

How fast does FTP realistically rise?

The honest answer: slower than advertising and forums promise. Beginners can gain 10 to 20 percent in their first year — most of it from consistency rather than program magic. Well-trained riders fight for two to five percent per season. Anyone selling you 250 to 320 watts in twelve weeks is either offering placebo or you tested incorrectly before.

Real progress rests on three levers: sufficient total volume — the zone-2 hours are not a garnish but the foundation on which intensity works — consistent progression over weeks instead of random hard riding, and genuine recovery. The last one is underestimated most: adaptation does not happen during the interval but in the rest afterwards — details in the article on recovery in endurance sports. And for everyone targeting a long event like a gran fondo: FTP is the single most important number in your gran fondo training, because it directly determines your sustainable race pace on the climbs.

The five most common power training mistakes

• Entering an FTP that is too high. Out of ambition, or because of an inflated ramp test, the value lands ten or twenty watts too high — and every zone with it. The result: sweet-spot intervals become threshold, zone 2 becomes zone 3, the week falls apart. Better to test conservatively.
• Never updating FTP. Riding for two years on an old value means training permanently too easy or grinding against outdated targets. Test every four to eight weeks, or at least sanity-check against race data.
• Riding easy sessions too hard. The classic error: zone 2 turns into permanent zone 3 because 190 watts "feel better" than 160. That erases the recovery the hard days depend on — intensity discipline matters on the bike just as much as in running.
• Dramatizing every power loss. Heat, altitude, fatigue and position change daily performance by five to ten percent. Individual weak intervals are noise, not a form crisis — what matters is the trend over weeks.
• Only intervals, no base. Power training is no license to drop the long easy hours. Without an aerobic base, FTP stagnates after the first season, no matter how hard the intervals are.

How Peakora steers your cycling training by watts

Peakora uses your FTP as the anchor of your entire cycling plan: structured sessions come with concrete power targets per interval, derived from your current threshold. After every completed ride, the power you produced feeds into the load calculation — your ride's TSS, the form indicator and the fatigue curve are based on real numbers instead of estimated time. And when an FTP test produces a new value, the power targets of all upcoming sessions scale automatically — your plan grows with your performance instead of staying frozen at last winter's level.

Frequently asked questions about FTP testing and power training

How often should I test my FTP?

Every four to eight weeks is enough — ideally at the end of a recovery week when you are fresh. More frequent testing costs training time and, because of normal test variability, adds little information. Between two tests, FTP realistically rises by two to five percent.

Do I need a power meter for power-based training?

For outdoor riding, yes — only a power meter measures output in watts independently of wind, gradient and cadence. Indoors, a smart trainer with built-in power measurement is sufficient; most current models are accurate to within one or two percent. Without any device, heart rate is the only fallback.

What is a good FTP value?

Absolute numbers say little — watts per kilogram of body weight are what count. A rough guide for amateur riders: below 2.5 watts per kilo is beginner level, 3 to 3.5 is a solid trained level, above 4 watts per kilo marks well-trained racers, and professionals sit at 5.5 to over 6.

Can I determine my FTP without a 20-minute test?

Yes. The ramp test — power rises by 20 to 25 watts every minute until failure — takes only 15 to 25 minutes and is less pacing-dependent: FTP = 75 percent of the last fully completed minute. Alternatively, analysis tools estimate FTP from the best efforts of your everyday rides.