Sculpt Your Waist and Flatten Your Belly With This 9-Minute Workout

4. Plank

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Start with your body on elbows (or hands) and toes. Do not let your back or legs sag or arch. Hold for 30 seconds, 2-3 times. Try other plank types: first on hands, then elbows, then side plank. Each session should last at least 2 minutes. Do not do this if you have had recent surgery, tendon problems, organ inflammation, or heart or blood vessel concerns.