The Best Circuit-Training Workouts
Works: legs, rear, core.
(A) Stand with feet hip-width apart, hands on hips. Lunge forward with your right leg so your knee is bent over your ankle and your thigh is parallel to the floor. Return to starting position. Lunge backward with your right leg; return to start.
(B) Lunge backward again, crossing your right leg behind your left and lowering into a curtsy. Return to start. Repeat for 30 seconds; switch sides.
Make it easier: Don’t lunge as deeply.
Make it harder: After the first backward lunge, lift your right leg to knee height and move into the curtsy.