The ab vacuum is the best. Lie on your back. Contract your abs about 30%. Inhale, using your chest. On exhale, pull your abs as far to your spine as you can. Hold. When you then inhale, relax your abs, but only back to the 30%. This can also be done on your hands and knees, sitting in a chair, in the elevator, where ever.
Bicycle- lie on your back, knee caps facing the ceiling. Beginners can start with your calves perpendicular to the floor, but work up to calves parallel to the floor. Tighten ab muscles. Straighten one leg to just above the floor, slowly. Bring back and straighten the other leg. Stop if you feel your back arching. Place your hands under your butt for back support.
Isometric hold on a ball: Lie with ball under lower back, knees bent and feet flat on floor. Spread feet for support. Hold head, neck and back straight and stable. Contract abs. Hold position for as long as possible. For intensity, put your arms in different positions.
Hope this helps...
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