STOP Sit - ups & Crunches, They Don't Work ... workout! ➡️ Strengthen Deep Core Muscles ➡️ Stabilize The Spine ➡️ Tighten The ... ... <看更多>

Apr 15, 2018 - Learn how to perfect the technique of one of the most common core exercises, and the best way to do it!Muscles worked: absInstructor: Dr ... ... <看更多>

Apr 15, 2018 - Learn how to perfect the technique of one of the most common core exercises, and the best way to do it!Muscles worked: absInstructor: Dr ... ... <看更多>