Crunch
Lie on your back with your knees bent and feet flat on the floor. Place your fingertips behind your ears. Now raise only your head and shoulders as you crunch your rib cage toward your pelvis. Return to the starting position and repeat quickly.
Jumping Jack
Stand with your feet together and hands at your sides. Now simultaneously swing your arms above your head and jump just high enough to spread your feet wide. Without pausing, quickly reverse the movement and repeat.
Body-Weight Squat
Hold your arms straight out in front of you and stand as tall as you can with your feet shoulder-width apart. Push your hips back and lower your body until your thighs are parallel to the floor. Drive back up to the starting position and quickly repeat.
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