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The thicker the wheel the more stabilization you will have to focus on abs. 

0:00 - 0:26 - On Knees Two Leg Ab Wheel

0:27 - 0:49 - On Knees One Leg Ab Wheel

0:50 - 1:42 - On Feet to Knees Two Leg Ab Wheel

1:43 - 2:12 - On Feet Two Leg Ab Wheel

2:13 - 2:27 - On Feet One Leg Ab Wheel