I think climbing stairs and skipping rope is a sport, which is very tiring and ineffective. It is not beautiful to exercise a muscle. I have a lighter but more expensive insistence. When I sat down, my knees bent, my toes touched the ground and my legs shook. When lying down, put your feet together, straighten your toes, tighten your legs and lift them up. People around me say I have thin legs. You can try. I wish you early success.