A regular old fashioned plank hold is NOT the only way planks can help you... Get a slim flat waist!
This workout contains 5 plank variations that hit the entire core.
8 MIN PLANK CHALLENGE!!
Jeff Cavaliere, MSPT, CSCS is a professional sports physical therapist and strength coach, and the creator of the ATHLEAN-X™ workout programs and Supplements.Read more about Jeff