Whether standing or kneeling, you exercise your abdominal muscles, chest muscles and upper arm muscles at the same time. The difference is that the distance between the landing point of the roller and the landing point of the body is greatly shortened when kneeling, and the difficulty is lower. However, if standing posture is adopted, if it is not very standard at first, you can keep your arm at a 90-degree angle with your body when the roller extends forward, and then slowly try to move forward with the increase of strength until you know that your whole body can lie flat on the ground without touching it.