Why Long Routes Pump You Out

There is a particular kind of misery that comes from being 20 metres up a long sport route, forearms swollen, and realising you still have half the climb to go. That is the pump. It happens when your muscles rely on anaerobic metabolism, producing lactate faster than your body can clear it. On short boulder problems, you can get away with pure power. On long routes, you need something different: a well-developed aerobic system that keeps your forearms supplied with oxygen and clears waste efficiently. The good news is that endurance is very trainable. With the right mix of easy mileage, interval work, and clever rest techniques, you can turn a pumpy nightmare into a steady, enjoyable outing.

Build Your Aerobic Base with ARC Training

ARC stands for Aerobic Restoration and Capillarity. It is the foundation of all route endurance. The idea is simple: climb continuously for a long time at a low intensity, never letting your forearms get more than mildly pumped. This builds capillaries, improves blood flow, and teaches your body to use oxygen efficiently.

How to do it: pick a grade you can climb comfortably, usually two to three French grades below your onsight limit. For many UK climbers, that means F5+ to F6a+. Find a vertical or gently overhanging wall with good holds. Climb up and down for 20 to 45 minutes without stopping. If you have to rest, do it on the wall, shaking out one arm at a time. Aim for two or three ARC sessions per week. You can do this on a bouldering wall by traversing, but a rope is better because it mimics the pacing of a route. At the crag, pick an easy route and climb it two or three times in a row with no rest.

Key point: if your forearms are burning, you are going too hard. ARC should feel almost boring. That is the point.

Interval Sessions for Route-Specific Endurance

Once you have a base, you need to teach your body to recover while still climbing. Interval sessions do this by pushing you into a pump and then forcing you to keep going. The classic is the 4x4: choose four boulder problems or route sections at a grade you can do comfortably, then climb all four back-to-back. Rest for the same amount of time it took you to climb them, then repeat the set three more times. That is four sets of four.

For long routes, a better option is linked climbing on a rope. Pick a route or a section of wall that takes 2 to 4 minutes to climb. Climb it, lower off, and immediately climb it again. Do this four to six times. The grade should be around your onsight limit or slightly below. You will get pumped, but you must keep climbing. The goal is to maintain good technique even when tired. If you start campusing or cutting loose, stop the set.

Another favourite is the up-down-up on a route: climb it, lower to a rest, then climb the top section again. This mimics the crux-to-shakeout rhythm of many UK sport routes.

Rest Like You Mean It

Endurance is not just about climbing more; it is about resting better. On a long route, every shakeout is a chance to recover. Most climbers rush them. Instead, find the best rest position – a kneebar, a heel hook, a stem, or a good sidepull – and stay there until your forearms feel noticeably better. Shake out one arm at a time, alternating. Drop your heel, straighten your arm, and breathe deeply. Use your skeleton, not your muscles.

Practise resting on easy ground. Next time you are at the wall, climb a route you find easy and force yourself to take five distinct rests. Count to ten in each one. You will be surprised how much recovery you can get. On a long route, aim to find at least three good rests. If you cannot find any, you are either on the wrong route or you need to look harder.

Pace Yourself and Break the Route Down

The biggest mistake on long routes is sprinting the start. You feel fresh, so you climb quickly, then you hit the crux already pumped. Instead, pace yourself. Count your moves between rests. Aim for a steady rhythm: three to five seconds per move, no faster. Breathe with each move. If you can chat, you are going too slow; if you are grunting, you are going too fast.

Break the route into three sections: the start, the crux, and the finish. Have a plan for each. Where are the rests? What is the sequence at the crux? What will you do if you feel pumped? Visualise the whole route before you tie in. On the climb, focus only on the section you are in. The finish is a problem for later.

A Sample Week to Get You Started

Here is a simple template for a climber training for a long sport route. Adjust to your schedule and recovery.

• Monday: Rest or easy bouldering.
• Tuesday: ARC session, 30 minutes continuous.
• Wednesday: Rest.
• Thursday: 4x4s on boulders or linked routes.
• Friday: Rest or easy traverse.
• Saturday: Project or onsight practice at the crag.
• Sunday: Rest or easy ARC.

Stick with this for four to six weeks. You will notice the difference on your first long route. The pump will still come, but it will arrive later and leave sooner. That is endurance. Now go and enjoy the view from the top.