5 Minutes of Slim Legs on the Chair, Perfect Lower Body in 30 Days. It's getting hotter and having a pair of beautiful legs in the summer is what many people hope for! Below, the coach will lead everyone to analyze from a physiological perspective first. The beauty of legs mainly depends on the length ratio of the legs and the elasticity of the muscles. There are roughly two reasons that affect the beauty of leg lines: one is the leg length, but the muscle curves are not enough, lacking vitality; the second is excessive accumulation of fat in the legs, making the legs appear loose.