Stand against the wall, put your legs together, put your left hand on your waist, straighten your right hand to the side, put your palm against the wall, hold your head high and look straight ahead. Take a step forward with your right leg, bend your knees, slowly squat your upper body into a right lunge, stop 10~ 15 seconds, then return to your original position and repeat the same action on the other side. It will be better to get into the habit of tummy tuck, and learn to be lean.