http://AskTheTrainer.com/stability-ball-exercises.html
Personal Trainer Michael Behnken, MS, NASM-CPT-PES, CSCS
Stability ball hip extension is a progression of the stability ball bridge.
If you cannot do this exercise without feeling the majority of the work being performed with your glutes you should regress.
If you feel your lower back perform this action, 100% you have weak glute muscles and most likely excessive anterior pelvic tilt.
Start a corrective flexibility program.
You can progress this exercise by adding a barbell or weight plate across your hips or placing an elevated or unstable surface under your feet.
If you have issues with exercise form you may have muscle imbalances.
http://AskTheTrainer.com/posture-problems.html
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