Posted by jj on August 03, 1998 at 03:42:33:
In Reply to: back pain after ball pumping?? posted by Rick on July 06, 1998 at 13:22:11:
Yes, Rick, I have, too. Haven't used pump, but when going to larger ball stretchers, have developed lower back pain, sometimes severe. I notice that when I lay off, it gets better.