Assume a modified pushup position with your feet shoulder-width apart, forearms on the floor. Keeping your torso steady, raise your right arm for-ward and to the right, so that it points to 2 o'clock. Hold for 2 seconds, then lower and repeat with your left arm, raising it to 10 o'clock. That's one rep. Your elbows should be bent 90 degrees and directly under your shoulders.