Photo credits: Top, James Michelfelder.
1. Stand with your feet hip-width apart. Bend over and place your hands on the floor just in front of your feet.
2. Shift your weight onto your hands and begin to walk them forward. Engage your core, squeeze your glutes, and keep a flat back as you walk forward until you reach a plank position. Reverse the movement and return to the starting position. That's one rep.