On steep ground you push off your thighs with your hands on every step and unload your legs. Learn the pole-free technique safely and in rhythm.
How do you climb a very steep trail without poles? The honest answer: You walk instead of running, place your hands just above the knee on your thighs and push off them on every step. You use your arms as support and shorten your stride. That spreads the work and lets your legs last longer.
An honest word on the data first: I found no study on "hands on thighs". The benefit is derived from pole studies, so it is transfer, not proof. On a treadmill at gradients up to 39°, perceived effort with poles was 14–19 % lower from 15.5° upward, and from 25.4° the energy cost per metre of climb fell by 2–3 % [1]. Also, with poles, upper-body and trunk muscles work more and pressure under the feet falls [2]. The core: arm force can help unload the legs. Whether that applies equally with hands on thighs is not proven.
The technique is easy to learn but hard on steep ground. Plan a few outings until breath, step and hand pressure run in rhythm.
Instead of running, you walk. With poles, strides on steep ground became longer in one measurement (+8.6 %) and stride frequency lower (−6.7 %) [1]. Without poles you lack that long lever. Practical tip: choose a medium, calm stride, not too short and not rushed, and get your push from the hand pressure.
Milestone: you walk 5 minutes of steep section at an even rhythm without gasping.
Place your hands flat just above the knee on the thigh, arms slightly bent, back long. When pushing off, you press down on the loaded leg as if helping to straighten it. Your torso leans slightly forward, gaze stays ahead.
Milestone: you feel a clean pressure impulse with each step without hiking your shoulders.
Link breath and step. A pattern to try: 3 steps inhale, 3 exhale (practice). When breathing gets ragged, your pace is too high. Then shorten the stride, do not push harder.
Milestone: you walk 10 minutes steeply uphill and can still speak a short sentence.
When terrain flattens, take your hands off the thighs, swing your arms loosely and shift into a jog. On roots, rocks or steps you also need free hands: decide before the obstacle, not in the middle.
Practise releasing deliberately: walk a climb with hands on thighs and take them off briefly every 20 steps to test your balance. That shows you how stable you still stand without support (practice).
Milestone: you release your hands in time and catch every bump with free arms.
Imagine you are pushing the mountain away beneath you: every hand push goes into the hip. If you feel that, the technique works. Practical: on very long climbs switch briefly between hands on thighs and freely swinging arms to relieve shoulders and back.
It is not directly proven. From pole studies we know arm force lowers perceived effort on steep ground (by 14–19 %) [1]. Many runners use the technique because they do not want to depend on poles.
When climbs are long and you have a lot of steep ground. A review shows poles reduce pressure on the feet [2]. For shorter ramps or technical terrain free hands are often more flexible.
There is no fixed limit. When heart rate and breathing run away at running pace, walking with hands on thighs is often more efficient. Try it in training, not in a race.
With hands on the thigh, not on the knee, you tend to unload. There is no study on it. With knee pain: stop the technique and have it checked.
Scrambling in Trail Running: Handling Easy Climbing Sections Safely