To do a 90-90 rock core training exercise, start in the 90-90 or tabletop position and roll the legs from side to side. Learn how in this free core training video lesson.
Expert: Kirk Vickers
Bio: Kirk Vickers is the owner of TRIAD Performance Gym and Training Center. He was twice voted as one of Americas Top 100 Trainers by Mens Journal Magazine.
Filmmaker: Travis Waack
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