Core for climbing: tension, not crunches

When climbers talk about core, they rarely mean a six-pack. They mean the ability to keep feet on the wall on steep ground, to stop the body swinging when a hand lets go, and to transfer force from the toes to the fingers. That is body tension, and it is trained differently from the crunches many people still associate with the word core.

What the core does in climbing

In climbing, the trunk acts as a link between the hands and the feet. Its main jobs are:

• Resisting movement: keeping the hips from sagging off the wall on overhangs, and stopping the body from rotating out on sidepulls.
• Transferring force: pushing through the toes on a toe hook or a steep foothold and feeling that force arrive at the hands.
• Creating movement: lifting the feet back onto the wall after a cut loose, or bringing the knees up for a high foot on steep ground.

The first job matters most and is the most neglected. Most of the time on the wall, your core is working hard to stop movement, not to create it.

Why crunches miss the point

Crunches and sit-ups train the trunk to flex the spine against little resistance. That is not useless, but it is a small part of what climbing asks for. Climbing needs a trunk that stays stiff while the limbs are loaded and stretched in awkward positions. Exercises that resist movement are a better match.

The categories worth training

Anti-extension

Stops the lower back arching and the hips dropping. On steep walls, this keeps your feet on.

• Front plank and long-lever plank
• Ab wheel rollouts, from the knees first
• Hollow body holds

Anti-rotation

Stops the body twisting. This is what prevents barn doors.

• Pallof press with a band or cable
• Side plank, with or without a top-leg lift
• Single-arm plank or bird dog

Hip flexion under tension

Lifting the legs while hanging is very specific to steep climbing.

• Hanging knee raises, progressing to straight-leg raises
• Toes-to-bar, if you have the shoulder control
• Front lever progressions for advanced climbers

On-wall tension

The most specific work happens on the wall.

• Feet-on drills: on a steep board or overhang, climb easy moves and keep your feet on at all costs.
• Slow moves: move hand to hand slowly, holding the body still.
• Toe hook holds: hold a toe hook and pull with the leg while keeping the body tight.

How much and how often

Core work does not need to be long. Two or three short blocks a week, done with good quality, are enough for most climbers. Hold positions for short periods with perfect form rather than long sets that turn sloppy. If your lower back aches during an exercise, regress it to an easier version.

A simple progression is to increase the lever (straighten the legs, extend the arms) before adding more time or load.

Body tension is the skill of staying in one piece while your hands and feet pull in different directions.

Connecting it to the rest of your training

Core tension links naturally to the carry and anti-rotation patterns described in The basics of movement, and to shoulder control in Shoulders for climbers. A strong trunk with weak shoulders, or the reverse, still leaks energy.

In Train Climb

• Coaches can add core exercises to planned sessions with sets and targets, and set a progression rule so the next sessions step up when an athlete is ready.
• Each athlete has a current level per exercise, which makes progressions like knee raises to straight-leg raises easy to follow.
• Log on-wall tension drills as a technique session and note the angle and drill used.
• Look at your effort (RPE) for core blocks over a few weeks. If it stays low, it might be time to progress.