The number that tells the whole story
Cycling climbing is ruled by one metric: watts per kilogram (W/kg). It is just arithmetic — your power output divided by your body mass — but it predicts climbing speed with remarkable accuracy. On gradients above 5–6%, the work against gravity starts to dominate everything else. Aerodynamics matter far less. Rolling resistance barely registers. What you are left with is you, your bike, and how many watts you can sustain per kilogram of combined mass. A recreational cyclist might push 2.5 W/kg at threshold; a strong amateur racer sits around 3.5–4.0 W/kg; a WorldTour climber operates above 5.5 W/kg on extended climbs. Understanding where you sit on that spectrum is the first step toward improving.
Here is what most riders get backwards: they immediately look at the denominator. Drop 3 kg, the thinking goes, and your W/kg improves by the same relative amount. That is technically true but wildly inefficient as a training strategy — particularly if you are already at a healthy weight. Reducing caloric intake significantly enough to lose meaningful mass almost always impairs training quality, slows recovery, and limits the power adaptations you are working toward. The research is consistent on this: increasing the numerator — your raw power output — is more reliable and more sustainable. When you raise your FTP through proper training, your body composition frequently improves as a byproduct anyway.
What actually improves your threshold power
The most direct path to a higher FTP — and therefore a higher W/kg — runs through your lactate threshold. This is the highest sustained intensity you can maintain before blood lactate begins accumulating faster than you can clear it. Push above it and you are borrowing time; your muscles will force you to slow down within minutes. Train it consistently over months and you expand the ceiling of what you can hold on a long climb.
Sweet spot training sits at roughly 88–93% of FTP and is arguably the most effective tool for time-crunched riders. Efforts in this range — 2×20 minutes, 3×15 minutes with adequate rest, or longer 40-minute blocks for more experienced riders — accumulate meaningful threshold stress without the deep recovery debt of full VO2max work. The adaptation lands primarily in your aerobic enzyme activity, mitochondrial density in slow-twitch fibres, and capillary density: the machinery that lets you sustain power for the duration of a real climb. Many riders who have been stuck at the same FTP for months are not doing enough sustained threshold work. They are doing lots of medium-effort group rides that feel hard but sit in a metabolic no-man's land — too hard to be Zone 2, too easy to drive threshold adaptation. The body adapts to the specific demands placed on it, and vague effort is a vague stimulus.
Threshold on/off efforts also deserve a place in a well-designed plan. These are short punchy efforts at 130–150% of FTP for 20–30 seconds, alternating with equal-duration recovery at low intensity. They repeatedly stress and clear lactate, which over time nudges your threshold higher and improves your ability to tolerate sharp accelerations on the road — the kind that happen every time a gradient kicks up mid-climb. For climbers, this secondary benefit matters enormously. Real roads are not power meters set to 250 W and held there. They pitch and relent and pitch again, and riders who have trained specifically for that rhythm handle it far better than those whose training has been purely steady-state.
Why your easy rides are doing more than you think
Your ability to clear lactate and sustain power does not live only in your interval sessions. It is built substantially during long, genuinely easy rides. The adaptations from low-intensity volume — improved mitochondrial function, greater fat oxidation capacity, enhanced cardiac output, increased stroke volume — are what give your hard sessions somewhere to land. Without that aerobic foundation, high-intensity work hits a ceiling faster and the recovery debt compounds. This is not a new idea in exercise science, but it is consistently undervalued by amateur riders who feel like easy riding is wasted time.
Aim to keep 75–80% of your weekly training volume at a genuinely easy pace. Nose-breathing intensity. Conversational effort. Well below your first lactate threshold. The riders who treat every group ride like a race and every Strava segment like a competition are often the ones stalled at the same W/kg for years. The easy rides need to be easy. The hard rides need to be hard. Drifting toward medium intensity on everything is the most common mistake in recreational cycling — and it is a slow trap because each individual ride feels productive while the overall training effect is poor. Zone 2 is also where you build the engine to handle repeated hard climbing days, whether in training blocks or during a sportive where you face four climbs spread over six hours.
A simple rule: if you cannot hold a conversation during your easy rides, you are going too hard. If you are surprised by how slow your easy pace actually is with a power meter or heart rate monitor, that is normal. Most riders discover their Zone 2 is significantly lower than they assumed, and correcting that is often the single change that unlocks progress after months of stagnation.
Tracking progress and structuring your season
Power data is your feedback loop. Without it, training on climbs is imprecise — heart rate lags effort by 30–90 seconds, perceived exertion is influenced by fatigue, heat, and altitude, and VAM (vertical metres per hour) only gives clean comparisons on the same climb in the same conditions. A power meter removes most of those variables and lets you train to specific physiological targets. That precision is what separates structured development from structured guessing.
Track your 20-minute power output — it is the most practical proxy for FTP most riders can test without a lab. Run a proper test every six to eight weeks, not every two weeks, and look for trends over months rather than chasing week-to-week noise. Expect early gains to come relatively quickly if you have never trained with structure before; once you are consistent and disciplined, improvements slow down and a 3–5% FTP gain over a twelve-week block is a solid, realistic result. Most recreational cyclists can move from 2.8 to 3.2 W/kg within a focused training season — a difference that turns climbs that used to break your rhythm into efforts you can manage and even enjoy.
The sequence matters too. Build your aerobic base in winter and early spring with high-volume, low-intensity riding. Layer in threshold work from late winter onward. Add intensity and VO2max work in the final weeks before your target event. Then ease off the volume and maintain intensity in the two weeks before the day itself. This is not complicated periodization — it is just doing the right work at the right time and not trying to build every quality simultaneously. If you want a structured plan that sequences this automatically based on your fitness and schedule, LeCoach builds personalised training plans that adapt as you progress — particularly useful if you would rather spend your time training than designing sessions.
Climbing faster is a long game. It rewards patience, consistency, and a willingness to do the unglamorous work — the long easy rides, the disciplined threshold sessions, the boring aerobic base miles in January. The riders who improve most are rarely those chasing every new training hack. They are the ones who understand the physiology, apply it consistently, and let the adaptations accumulate over time. Your W/kg will follow.
Sources: Relationship between critical power and different lactate threshold markers in recreational cyclists (PMC, 2021); The science of cycling: physiology and training — part 1 (PubMed, 2005)