Feet against the wall at 90 degrees will be thin, because the legs are trying to consume fat. After finishing the exercise, press leg press and stretch well to prevent the muscles from getting thicker and longer. And stovepipe is a long-term exercise, and persistence will have an effect.
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Precautions:
Don't let your knees exceed your toes: if you squat against the wall, if your knees exceed your toes, your body's center of gravity will shift, causing excessive pressure on your knee joint and aggravating the pain.
Don't buckle your knees: when squatting, buckling your knees will cause pressure on the inside of the knee joint, especially the patella, and it will also cause problems such as incorrect alignment of the force lines of the lower limbs and discomfort.
People's Network-Handstand Leg Hanging Action 3 Minutes Skinny Leg 1cm