Source: Journal of Strength and Conditioning Research
Summary:
One group of untrained women performed curl-ups and back extensions on a physioball and another group did the exercises on the floor in a 5 week study
Tests included electromyography of abs and back muscles; abs, back, and knee strength; and balance
Physioball group had higher EMG and balance scores than floor training group
Conclusion: Exercises on physioball were more effective in improving core stability and balance than exercises done on floor
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