FTP explained: what it is, how to test it, and how to actually raise it

FTP — Functional Threshold Power — is the highest power you can hold for roughly an hour. It's a single number, measured in watts, and it quietly sits underneath almost everything in structured cycling: your training zones, your workout targets, how hard "hard" is, and how you stack up against last season. Get FTP right and the rest of your training has a solid floor to build on. Get it wrong and every zone you ride is off by the same margin.

What FTP actually is

Physiologically, FTP is a practical stand-in for your lactate threshold — more precisely the neighbourhood of your maximal metabolic steady state, the hardest intensity at which your body can still clear lactate about as fast as it produces it. Ride just below it and you can hold on for a long time. Nudge above it and lactate accumulates, your legs fill, and the clock to failure starts ticking down fast.

Why roughly an hour? Because that duration lands close to that steady-state limit for most trained riders — long enough that anaerobic contribution washes out, short enough that fuelling and heat don't dominate. It's an approximation, not a lab measurement, but it's a very useful one: cheap to estimate, easy to re-check, and stable enough to build a season around.

FTP is reported in watts (raw power). But on anything that points uphill, what matters is watts per kilogram (W/kg) — your FTP divided by your body weight. A 300 W rider at 90 kg (3.3 W/kg) and a 240 W rider at 60 kg (4.0 W/kg) will meet very different versions of the same climb. Track both: watts for the flats and the turbo, W/kg for the hills.

The seven training zones your FTP sets

Set your FTP and every zone falls out of it as a percentage. This is why the number matters so much — a 10% error here shifts every workout you do. Here's the classic seven-zone map:

Segment widths above are illustrative — the higher zones are open-ended (there's no ceiling on a sprint), so they're drawn wider for legibility, not to scale.

What counts as a good FTP?

There's no universal "good" — it depends on your weight, your goals and how long you've trained. But W/kg gives a fair yardstick. The rough guide below is for men; it's approximate, and figures for women typically run around 15% lower at the same relative level. Remember: on the flat, raw watts win; on a climb, W/kg is king.

Treat these as ballpark bands, not pass/fail lines. A recreational rider clearing 3.0 W/kg is going well; 4.0+ is genuinely strong club form.

How to test it

There are several ways to pin down your FTP, trading accuracy against how much they hurt and how much of your day they eat. Pick the one you'll actually repeat — a consistent test you do every few weeks beats a perfect one you dread and skip.

Whichever you choose, keep the conditions the same each time — same warm-up, same course or trainer, ideally rested and fuelled. FTP only tells you something when you can compare like with like.

How to actually raise it

You don't raise FTP by testing more often — you raise it by training the systems that set it, then letting them adapt. In practice that means structured time near and above threshold, stacked on a broad aerobic base. Here are the four levers that do the heavy lifting:

How you weight these is the old sweet-spot vs polarized debate. Sweet-spot training packs a lot of adaptation into limited hours by living at 88–94% FTP — great for the time-crunched. The polarized camp argues for mostly easy riding (Z1–Z2) with a small dose of very hard work (Z5+), keeping the middle "grey zone" thin. Both raise FTP; the right mix depends on your hours, your history and your event. The one thing neither camp disputes: consistency and recovery decide who actually improves.

Common mistakes

• Testing too rarely — or never. If your FTP is stale, every zone you ride is wrong, and you can't tell whether the plan is working.
• Living in the grey zone. Riding everything at a comfy-hard tempo feels productive but is too easy to drive top-end gains and too hard to recover from. Make easy days easy and hard days hard.
• Chasing the number over the process. A single test is noisy. Trends across weeks of consistent training tell the truth; one bad test day doesn't.
• Ignoring recovery. Fitness is built when you rest, not when you're hammering. Skimp on sleep and easy days and the adaptations never land.

Let Moveee handle the number for you

Here's the part we care about: you don't actually have to block out a test day. Moveee reads your best real efforts across every duration and estimates your FTP straight from your ride history — then keeps it fresh after each hard ride, no dreaded ramp on the calendar. From that one number it sets all seven of your zones and builds every workout around them, so your targets are always tuned to the engine you have today. Have a look at your power profile, or connect with Strava and let Moveee find your FTP for you — free, and with a real route to ride each session on.