Climbing endurance training comes down to three kinds of work: long spells of easy climbing, steady intervals a couple of grades below your onsight, and a small amount of hard, pumpy power endurance on top. Many climbers do plenty of the last and almost none of the first two. Get the balance right and endurance tends to respond within weeks rather than years, which is why it can feel like the cheapest grade you’ll ever earn.
This post covers what each kind of endurance is, how much of it you need depending on whether you climb routes or boulder, and a six-week plan you can run on a normal gym wall.
What “endurance” means for a climber
When climbers say endurance, they usually mean one of three things:
- Staying power on easy ground. Climbing for a long time at a low grade without your forearms filling up. This is the base everything else sits on.
- Recovering while you climb. Getting a pump, easing off on a good hold or easier section, and feeling it go down. This decides whether a long route with a few rests is possible for you.
- Power endurance. Hard moves, in a row, for one to a few minutes, with a big pump at the end. Think of a sustained steep section or a long boulder.
The first two are mostly aerobic: your forearms are using oxygen fast enough to keep going. The third is where you outrun that supply and the pump builds quickly. All three matter, but they’re trained differently, and the hard, pumpy kind has the least room to grow if the easier kinds are weak.
Why forearm fitness matters more than running fitness
The research here is small but points the same way. In a study of 21 male sport climbers, Fryer and colleagues found that forearm oxidative capacity (how well the forearm muscles use oxygen) and oxygen uptake measured while climbing on a treadwall both predicted red-point grade. Running fitness on a treadmill didn’t. Together, the climbing-specific measures accounted for about two-thirds of the variation in grade between the climbers.
It’s one small study showing a link, not cause and effect. But the practical point holds: going for a run won’t do much for your pump. Endurance for climbing is built by climbing, with your forearms doing the work.
The three kinds of endurance training
1. Easy mileage (continuous climbing)
Climb without stopping for 20 to 45 minutes on terrain well below your limit, staying at a light pump you could hold all day. Coaches often call this ARC training, and Lattice’s endurance guide describes it as continuous low-intensity climbing at a level where you barely feel pumped.
On a bouldering wall, this means a long, looping traverse or linking easy problems up and down. On ropes, it means laps on easy routes with a partner lowering you straight back to the ground, or an auto-belay if your gym has one on suitable terrain.
The intensity is the whole session. If you’re getting properly pumped, step down a grade or use bigger holds. If it feels too boring to continue, that’s roughly right.
2. Interval laps (aerobic capacity)
Shorter efforts with equal rest, a bit harder than easy mileage. A good standard session is ten one-minute efforts with a minute’s rest between them, at roughly two grades below your onsight. The pump should creep up over the session and only get high towards the end. If it’s high by the third rep, the grade is too hard.
On a bouldering wall, a one-minute effort is a circuit on jugs and good edges that takes you about a minute at a relaxed pace. On routes, the simplest version is one short, easy route per rep, resting for as long as the climb took.
3. Power endurance (pumpy, hard and short)
Hard climbing for one to three minutes, with long rests, close to the point where your grip starts to fail. Linked boulder problems and 4x4s live here. This is the kind that makes you feel like you’ve trained, which is exactly why climbers overdo it.
It does work, and quickly, but the gains stop sooner too. Lattice’s power-endurance tips for route climbers say this hard, close-to-failure work builds fast but hits a ceiling sooner than aerobic capacity or strength, and suggest blocks of around six to eight weeks. Treat it as the last few weeks before a trip or a project, not something you do all year.
Side by side
| Easy mileage | Interval laps | Power endurance | |
|---|---|---|---|
| Effort | 20–45 min continuous | 1 min on, 1 min off, ×10 | 1–3 min, long rests |
| Grade | Well below onsight | About 2 below onsight | Near your limit for the length |
| Pump | Light, steady | Builds slowly, high at the end | High |
| Main job | Base, recovery between hard sessions | Forearm aerobic capacity | Sustained hard sections |
| How often | Any session, often as a finisher | 1–2 a week | 1 a week, in short blocks |
How much endurance work you need
Lattice suggest that a route climber training three times a week should have an element of endurance in at least two of those sessions, and that a boulderer needs about one, at lower volume and intensity. That fits most climbers’ experience: if your goal is routes, endurance deserves a real share of your week. If you mostly boulder, a short endurance finisher once a week helps you recover between attempts and on long problems without eating into your limit climbing.
If you’re in your first year, you don’t need a separate endurance plan. Climb more routes, more problems and more varied terrain, and most of this develops on its own. The structure below is for climbers who have been at it a year or more and find routes falling apart halfway up. If you’re not sure that’s your problem, why routes lag behind your boulder grade walks through how to tell pacing, resting and fitness apart.
A six-week endurance plan
This assumes three sessions a week, with a goal of routes or longer, pumpier boulders. It adds endurance to two sessions and leaves one for hard climbing, because your boulder grade is what makes cruxes feel manageable. Warm up for 10 to 15 minutes on easy ground every time, building gradually.
| Week | Session A | Session B | Session C |
|---|---|---|---|
| 1 | Interval laps: 6 × 1 min on / 1 min off | Hard bouldering, then 20 min easy mileage | Easy mileage: 25 min |
| 2 | Interval laps: 8 × 1 min | Hard bouldering, then 20 min easy mileage | Easy mileage: 30 min |
| 3 | Interval laps: 10 × 1 min | Hard bouldering, then 20 min easy mileage | Easy mileage: 35 min |
| 4 | Interval laps: 10 × 1 min, holds a little smaller | Hard bouldering | Power endurance: 3 sets of linked problems, 4 min rest |
| 5 | Interval laps: 10 × 1 min, holds a little smaller | Hard bouldering | Power endurance: 4 sets, 4 min rest |
| 6 | Easy mileage: 20 min | Hard bouldering, short | Retest |
Running it well
Progress one thing at a time. Add reps first (weeks 1 to 3), then make the climbing slightly harder (weeks 4 and 5). Don’t shorten the rest and raise the grade in the same week.
Use the same circuits. Repeating the same circuit or the same handful of routes across weeks is what lets you see progress: the pump arriving later, your feet staying precise for longer.
Stop on form, not on failure. For easy mileage and intervals, end a rep or the session when your feet start cutting, you’re slapping for holds or you can’t let go of a hold to shake out. For power endurance, you’ll get close to failure by design, so choose problems on good holds rather than small crimps.
Put endurance after hard climbing, not before. On days with both, do your limit bouldering first while you’re fresh. Easy mileage makes a good finisher and a gentle extra session; it won’t wreck tomorrow the way a hard session does.
Mistakes that keep climbers pumped
- Every session at power-endurance intensity. Climbing to a full pump three times a week feels productive and mostly leaves you tired. The easy work is what lets the hard work pay off.
- Easy mileage that isn’t easy. If you’re shaking and pumped after ten minutes, it’s an interval session in disguise. Go easier.
- Forgetting your fingers. Hundreds of easy moves still load your fingers. Keep endurance on bigger holds, and if you feel a sharp pain or a pop, or a finger is still sore the next morning, stop and see a physiotherapist. The red flags that mean stop covers what to watch for.
- Training endurance on the hangboard instead of the wall. Repeaters have their place for climbers ready for hangboard work, covered in repeaters vs max hangs, but they don’t teach you to rest, clip or move well while tired. Climbing does.
- No pacing on the wall. Fitness can’t fix gripping every hold as hard as you can. Use your easy mileage to practise holding on with as little effort as you need.
How to tell it’s working
Pick one benchmark before week 1 and repeat it in week 6, fresh, at the same time of day and on the same wall. Good options:
- How many moves of a fixed traverse you can do before you have to step off.
- How many laps of one easy route you can do before your feet get sloppy.
- How many hangs you take on a route just above your onsight.
Lattice’s guide suggests most climbers see measurable improvement within four to six weeks of consistent endurance training, so six weeks is a fair first test. If your benchmark hasn’t moved, check the basics first: were the easy sessions genuinely easy, and did you actually do them? How to run a retest you can trust explains how to keep the test fair enough to believe the result.
If you’d rather not juggle the intervals, mileage and retests yourself, Mantle builds your week from what you log and adjusts the balance between endurance and hard climbing as your results come in.