Benefits: Tones pectorals, triceps, and shoulders.
How-To: A quick and easy way to work your entire upper body is to follow the plank with one set of pushups. Start on your knees if needed, and remember to keep your abdominals in and your back straight. Try just one in the beginning and work your way up to 12.
Tip: Pushups are tough because you’re lifting your own body weight. If the classic position isn’t working, do them against a wall, chair or bed and work your way down to the floor.