You know that moment when the road tilts up and the wheels in front start drifting away? That's not bad luck. That's a fitness gap — and hill repeats are how you close it.
Before power meters, before smart trainers, before structured plans, riders went to a hill and rode up it. That's it. The session pre-dates everything we now consider modern coaching, and yet John Wakefield still prescribes versions of it to the WorldTour riders he coaches. Friel built whole training plans around it. The reason is simple: gravity doesn't lie. You either hold the power or you don't.
Here's the good news. Hill repeats build threshold power, muscular endurance, and the kind of grit that decides results in the last 10km. If you want to stop getting dropped on climbs, this is the session you're missing.
Why hills work
Gravity enforces honest effort
On a flat road, you can hide. Tuck behind a wheel. Drift through a roundabout. Coast for thirty seconds and pretend it didn't happen. On a hill? Nowhere to go. Stop pedalling and you stop moving. Every second of the interval is a second of work.
More force per pedal stroke
Climbing at 5-8% with moderate cadence (70-85rpm) loads each pedal stroke more than the same power on the flat. That's the muscular endurance you need on long climbs and on the third surge of a hard group ride. The gym is one route to that adaptation. Hills are the other.
The summit you can't see
There's a specific kind of suffering that comes from being able to see the gradient ahead but not the top. That's the suffering of a real climb. Hill repeats train your brain for that exact scenario — mental toughness training disguised as physical training.
Choosing your hill
Gradient: 5-8% is the sweet spot. Steep enough to demand effort, not so steep you're grinding at 50rpm.
Duration: Match the hill to the interval. A 3-minute climb for VO2max. A 6-8 minute climb for threshold. A 15-20 minute climb when you're training for a real sustained effort.
Surface and traffic: Clean tarmac, no traffic lights, low traffic volume. You need to focus on the effort, not on cars.
Descent: Has to be rideable at recovery pace. Technical or dangerous descents wreck the recovery and bleed into the next repeat.
Session structures
Threshold hill repeats
Target: FTP development (use our FTP Zone Calculator to set your exact power targets) Interval: 5-8 minutes at 95-105% FTP Recovery: Descend easy (3-5 minutes) Repeats: 4-6 Cadence: 75-85rpm
VO2max hill repeats
Target: Maximum aerobic power — the engine Interval: 3-4 minutes at 106-120% FTP Recovery: Descend easy (3-4 minutes) Repeats: 5-8 Cadence: 80-90rpm
Strength-endurance hill repeats
Target: Muscular endurance, low-cadence torque Interval: 6-10 minutes at 85-95% FTP Recovery: Descend easy (5-6 minutes) Repeats: 3-5 Cadence: 60-70rpm (seated, big gear)
Short power hill repeats
Target: Anaerobic capacity, the punch over the top of a climb Interval: 60-90 seconds at 130-150% FTP Recovery: Descend easy (2-3 minutes) Repeats: 8-12 Cadence: 85-95rpm (seated or standing)
Pacing
The mistake most riders make: full gas on rep one. By rep three they're hanging on. By rep five the session's done — but they keep going at 80% of target and call it training.
It's not. Pace the first one at the bottom of your zone. The first should feel controlled. The last should hurt. That's the shape of a good session.
The 10% rule: if your power on the final repeat drops more than 10% below the first, you're done. Junk intervals at 80% of target don't build threshold. They build fatigue without adaptation.
Warm-up
Ride 15-20 minutes to the hill at an easy pace, including two or three progressive 30-second openers. Cold legs on rep one mean rep one becomes part of your warm-up — and the whole session is now five reps, not six.
Progression
- Week 1-2: 4 repeats of 4 minutes
- Week 3-4: 5 repeats of 5 minutes
- Week 5-6: 6 repeats of 5 minutes
- Week 7-8: 6 repeats of 6 minutes
Volume first. Then duration. Then intensity. That order matters — flip it and you accumulate fatigue without the adaptation. Same principle Seiler's polarised work points to: get the easy stuff really easy, get the hard stuff sustainable, and let the volume of quality work do its job over weeks, not single sessions.
The session in one paragraph
Pick a clean 5-8% climb. Match the duration to the goal — 3-4 minutes for VO2max, 5-8 for threshold, 6-10 longer and lower-cadence for strength-endurance. Warm up properly so the first rep isn't part of the warm-up. Pace controlled on rep one, hurt on the last. If your power drops more than 10% from first to last, call it — junk intervals at 80% of target don't build threshold, they build fatigue. Progress volume before intensity over 6-8 week blocks. And pair the engine with climbing-specific skills so you can actually use it on the road.
For event-specific prep, the Etape du Tour, Haute Route Alps, Maratona dles Dolomites, and Mallorca 312 guides slot hill repeats into the wider plan.
If you'd rather have someone programme it around your week, NDY coaching at Roadman writes that. The application is where the conversation starts. Got a specific question — your own gradient choice, when to add tempo above threshold, how to programme around a long sportive? Ask Roadman for an answer drawn from the actual coach conversations on the podcast.