Ab Wheel Exercises
Conquered the Plank? Try the Ab Wheel — These 4 Exercises Will Make Your Whole Body Shake
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Eric and Ryan called the standing ab wheel rollout "the king of all ab wheel exercises." It's very challenging, so they recommended a slight modification: from a standing position, roll out into a full extension against a barrier, which will allow you to come to a stop. Then, drop to your knees and roll back.