Place your hands shoulder-width apart on a bench or box, assuming a strong plank position ( A), bend your elbows to slowly lower your chest to the bench, pause here (B).
Place your hands shoulder-width apart on a bench or box, assuming a strong plank position ( A), bend your elbows to slowly lower your chest to the bench, pause here (B). Keep your upper arms from flaring out as you push back up explosively to a straight arm position. Repeat. Raise or lower the box height to decrease or increase the difficulty, respectively.