제 목    KSfmKZGGuX 이 름    Jessica 날 짜    2018/06/29 조 회    8 A Second Class stamp ketopia medical reviews Start in the push-up position. Keeping your hips at the same height as your shoulders, shuffle your right knee in toward your chest, and then immediately switch it out for your left knee. Think of this move as trying to run in a horizontal position. You want to do these continuously, without rest, as many times as you can while still keeping your hips and shoulders at the same level.