The Best Circuit-Training Workouts
Works: core, chest, arms, legs, rear.
(A) Stand with feet shoulder-width apart. Come into a squat, placing your hands on the floor in front of your feet. Jump your feet back so that your body is straight from head to heels.
(B) Bend your elbows and lower your chest toward the floor (resting on your knees if necessary), then press up and jump your feet back to your hands.
(C) Jump straight up, reaching your arms overhead. Repeat from beginning.
Make it easier: Take out the push-up or the jump.
Make it harder: As you jump your feet back, bend your elbows so you bypass plank and land in the push-up.