ONE-ARM push-ups strengthen nearly every part of your body, including triceps, chest, core, lower back, and obliques. This is the king of push-up exercises!

Begin in the classic, upward push-up position with your body and head straight. Place one arm behind your back, spread your feet a little wider than shoulder-width apart, then slowly lower your body until you are 3 to 6 inches from the floor. Slowly press back up to starting position. Repeat 10 to 15 reps for 2 to 3 sets.