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Repetitions: 15 on each leg
Assume a full plank position with your arms straight, hands below your shoulders, and feet together.
Lift your right foot off the floor and drive your right knee as close to your chest as possible. Return to the starting position and immediately repeat the movement with your left leg. Don’t change your lower-back posture as you lift your knee—keep your hips low and stable.
Continue alternating at a quick, fluid pace until you’ve done 15 reps on each leg (about 30 seconds).
You don't need any equipment to get trim and toned from head to toe
No-Equipment Workout: Get Slim for Summer