Stemming: how to climb corners and dihedrals

A hold you make yourself

Walk up to a corner where two walls meet and the holds look thin, and it is easy to feel cheated. There is nothing obvious to pull on. Stemming, sometimes called bridging, is the answer to exactly that. Instead of hanging off holds, you press outwards against the two facing walls and let the opposition hold you in place. Your feet push apart, the friction takes your weight, and suddenly a feature with barely a hold on it becomes somewhere you can stand all day.

It is one of the few techniques where the wall does the work for you. Learn to read a corner and you will start walking up ground that stops stronger climbers who only know how to pull.

Why opposition works

A stem is a simple bit of physics. Push your left foot into the left wall and your right foot into the right wall, and each push holds the other in place. Neither foot would grip on its own, but together they lock. The steeper and smoother the corner, the more you rely on this, and the more precise your foot pressure has to be.

The prize is that your weight goes down through your legs, which are strong and do not tire quickly, instead of hanging off your fingers, which are neither. A good stem feels almost like standing in a doorway with a foot on each frame. You are braced, not gripping, and that changes how long you can stay there.

Setting the stem

The shape matters more than the effort. A few things to get right:

• Feet wide and level. Spread your feet onto the best bit of each wall you can find, a small edge, a ripple, or just clean rock for a smear. Push them apart, not down. The wider the stance, the more of your push turns into useful sideways pressure.
• Hips into the corner. Keeping your hips close to the back of the corner stacks your weight over your feet and keeps the pressure honest. Let your backside drift out and away from the rock and the stem starts to slip.
• Hands palming, not crimping. In a real corner there is often nothing to hold, so your hands press flat against the walls the same way your feet do. Palm down and out on the sidewalls for balance and a little extra opposition. Look for the odd side pull to steady yourself, but expect to be pressing more than pulling.

Moving up a corner

You do not stride up a stem, you shuffle. Keep three points of contact pressing while you move the fourth, then swap. Raise one foot to a slightly higher smear, reset the pressure, then walk your palms up the sidewalls to match. Small steps keep the opposition alive. Big reaches break it, and the moment you lose the outward push you are off.

Watch your feet as they get higher. On a lot of corners the walls narrow as you climb, which actually helps, because a tighter corner needs less pressure to hold. On others the corner opens out and the stem gets desperate right where you want it to be easy. Read that ahead of time so the widening does not catch you by surprise.

The rest nobody else finds

The best thing about a stem is the rest hiding inside it. Once you are braced with a foot on each wall and your weight settled over your legs, you can often take a hand off entirely, hang it by your side, and shake the pump out. On a long pitch that no-hands stem can be the difference between clipping the chains and taking the whip.

Learn to spot these. Any groove, corner or wide feature on a route is a candidate. When you are pumped and looking for somewhere to recover, stop hunting for a jug and ask whether you can bridge across and stand instead.

Where it goes wrong

The usual failure is feet too low and too close together. A narrow, low stem gives you almost no sideways push, so your feet skate and you end up fighting it with your arms. Get the feet wider and think about pressing out, not standing on.

The second mistake is rushing. Stemming rewards a slow, deliberate pace, and punishes the climber who lunges for the next hold and forgets to keep pushing. If a corner feels frantic, you have probably stopped bracing. Reset your feet, get your hips back in, and slow the whole thing down.

The last one is forgetting your hands can press too. New climbers reach up a corner looking for something to grip and find nothing, then panic. The palms are holds you make, exactly like the feet. Trust them.

Drill it in

Find an easy corner or a gym feature where two walls meet, something well within your grade, and climb it using only stems and palms. Ban yourself from proper holds even if they are there. It will feel strange at first, then it clicks, and you start to feel where the opposition lives. Play with hip position and foot width and notice how much the stance changes with each.

Then try to find the rest on every corner you climb. Bridge out, drop a hand, and see how long you can stand there breathing. Log the routes where a stem saved you a fall or bought you a shake-out, and over a season you will start seeing corners the way good climbers do, not as blank rock, but as a hold you build with your own two feet.