Grasp the bars of a dip station and hoist yourself up so your arms are completely straight. This is the start. Lower yourself until your upper arms are parallel to the floor, working hard to keep your elbows as close to your torso as you can. Pause; then straighten your arms to return to the starting position. That’s 1 rep. If that’s too hard, do reps with your hands on a chair behind you and your feet on the floor straight in front of you.