If your ass is thin, you don't need special exercise. As long as you consciously pinch your ass while standing, the effect will slowly come out. If it's skin and bones, it's thighs. I guess you don't like running very much Hehe, squat with weight, each group 15. Just stick to three groups every day. It's easy to lose your legs and ass. You can eat more food to eliminate edema, not too salty, which is not conducive to the elimination of excess water in lower limbs. Take your time to get in shape. Don't worry, persistence is very important. Boys' physique belongs to thin physique, so believe in yourself. Also, set an alarm clock to remind yourself and supervise you for me.