Targets shoulders, abs, obliques, and legs. In the place of gliding disks you can use paper plate on carpeted floor or a small towels on hardwoods.
Step 1: Start on floor in full plank position, forefeet on gliding disks (paper plates or towel).
Step 2: Keeping upper body steady, bring right knee toward left elbow by sliding right foot under body.
Step 3: Slide right foot back to start, then quickly switch sides
Step 4: Repeat.
This exercise is from Fitness Magazine.
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