These balls do exactly what they say they do. They are sticky enough to stay in place, firm enough to allow myofascial relaxation, but flexible enough not to aggravate pain. I don't know how they are used for training. I use them as part of myofascial relaxation yoga class. I've tried other balls and objects at home and none come close to what these do. Now I can do for myself what I've paid massage therapists thousands of dollars to do over the years. I highly recommend!
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