Learn frogging in bouldering: place both feet high and wide, knees out, hips close to the wall and push up with your legs. Step by step with clear milestones.
Frogging gets its name because you look like a frog on the wall: both feet stand wide and high, knees and toes point outward, your hips are close to the wall. You push yourself up with your legs instead of pulling up on your arms. The honest answer to "Isn't that pointlessly inelegant?": it is inelegant and still one of the most efficient ways to gain height. Whoever masters it saves many arm moves.
In sports science frogging belongs to the frontal techniques, where hips and chest face the wall. The systematization by Dech and Kittel lists it as its own technique, with no rotated counterpart [1]. The underlying "X position" is characterized by a low center of mass close to the wall, bent knees, nearly straight arms and big toes pointing outward [1]. One benefit of being close to the wall: the lever arm gets shorter and the pull on your fingers drops [1]. A caveat right away: in a lab study, nine elite climbers kept their center of mass on average about five centimeters further from the wall than the comparison group [2]. "Hips close" is a useful cue, but not a law.
Expect it to take a few sessions until the position feels natural (an experience value, not a measurement).
Entry criteria (practice standard):
Stand at the wall, hands on big holds. Feet wide, toes and knees out, hips close to the wall. Your arms stay almost straight, the load lies on the big toes [1].
Milestone: You hold the frog position stable for ten seconds.
Put both feet at knee or hip height as far as your hips go comfortably. Force nothing: a position that pinches is too high or too wide. If you hesitate between two heights, take the lower one. It is more stable, and you can build it up later.
Milestone: You stand for ten seconds without a shoe moving.
Straighten your legs and keep your arms long. The movement comes from the thighs and hips, not from the back or arms. In a small study, more experienced women climbers loaded the footholds harder and needed less heart rate and oxygen [3].
Milestone: Three clean stand-ups in a row without your arms bending.
From the pushed-up stance you reach for the next hold and sink back in. The rhythm is: reach, sink, push.
Milestone: Five sequences without pulling with your arms.
Climb an easy boulder and build in two passages with widely placed feet. Decide on each move whether the frog position helps.
Milestone: One calm run without slipping off.
Wide, high steps load hips and knees. In a case series of 77 acute knee injuries in climbers and boulderers, the high step was responsible for about a fifth (21 percent) of the cases [4]. A case series says nothing about risk per move, but it shows where knees suffer. Warm up hips and legs, increase the height slowly and stop if your knee or hip pinches. Start at jump-down height. This guide explains and motivates but does not replace supervised training. Have a coach show you falling technique and mat rules.
Imagine you want to kiss the wall with your hip. That thought brings the hip closer to the wall and lets the knees fall outward on their own. This is practical experience and not proven, but for many people it works faster than any explanation about joint angles.
In frogging you place both feet wide and high, knees and toes point outward, and your hips are close to the wall. You push yourself up with your legs and save arm strength. It counts as a frontal technique [1].
Whenever you want to gain height on a vertical or slightly slabby wall and have several footholds at knee to hip height. It helps especially when your arms are already tired.
Not always. A close hip shortens the lever arm and relieves the fingers [1]. In a lab study, though, elite climbers kept their center of mass further from the wall than control participants [2]. Try what works on your route.
Frogging is a frontal technique: chest and hips face the wall, both feet stand wide. When you turn in, you rotate one side of your body toward the wall and step with the outer side of the shoe. According to the systematization, frogging has no rotated counterpart [1].
It loads hip and knee, especially with very high or wide steps. High steps are among the mechanisms of acute knee injuries in climbers [4]. Warm up, increase the height slowly and stop if it pinches.
Stemming: Standing Between Two Walls