Photo credits: Top, Shutterstock; Steps 1-2, James Michelfelder.
1. Bend your elbows 90 degrees and rest your weight on your forearms. Your elbows should be directly beneath your shoulders, and your body should form a straight line from your head to your feet.
2. One arm at a time, push yourself into a pushup position, arms fully extended beneath you. Lower yourself, one arm at a time, back down to the elbow plank starting position. That's one rep.