The double leg 90-90 butterfly exercise with extension is an intense core training workout for building strength and body control. Learn how to do this great core exercise in this free fitness 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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