Men: Lie face down with your palms on the floor beside your shoulders. Without arching your back or bending your knees, push against the floor with your hands to raise your body, stopping just before your elbows lock.

Women: Same as for men, but support your weight on your knees rather than on your toes. Count the number of push-ups you can do without resting and compare with the chart below. If those are too hard, strengthen your upper body by doing them standing up, leaning against a wall. (Don’t do any kind of push-up if you have a bad back.)