Being a mobility impaired person with some ISG issues, I have quite tight muscles. I can smooth most things out with a lacrosse ball or spring band. However, the psoas is a difficult area to relax. This ball is perfect for me. It is large enough to penetrate deep areas where the psoas is located. Basically, I just lie on my stomach with this ball and find the sore spots. I'm 6ft 225lbs and this 4 inch ball has worked great for me.
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