This asana stimulates the muscles in your legs, especially the hips and thighs. Sitting on a chair is easy, but when you sit on an imaginary chair, your muscles are exerted as they hold the fort for your body. Your body weight rests upon your legs, especially on the muscles of the hips and thighs. This not only tones your legs and builds muscle but strengthens the area too. 12 Yoga Exercises To Get Your Thighs And Hips In Shape.