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Anonymous
Floor sweepers. Lie down on your back and have someone hand you a barbell. Hold the barbell out like the starting position for a bench press. Contract your abs and lift your legs a few inches off the floor. With your legs straight out, bring your toes to one side on the barbell, about 8 inches away from the bar. Bring your legs back to the starting position, then swing them to the other side. That's one. Try doing 3-4 sets of 10. When that's easy, try adding weight to the barbell.
The weight forces your core to contract to keep the weight stable, forcing you to keep your entire body tense while you do the exercise.
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