9-Minute Workout for a Flatter Belly and Slimmer Waist

4. Plank

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Support your body on your elbows (or hands) and toes. Do not let your back or legs sag or arch. Hold for 30 seconds, 2–3 times. Try variations: hands, elbows, then side plank. Each session should last at least 2 minutes. Do not perform if you recently had surgery, tendon issues, organ inflammation, or heart or vascular problems.