I bought an AB Circle Pro excersizer in June. It has slippery plastic knee cups which makes it very hard to keep your knees in. My knee slipped out and I fell hurting my chin and tearing a ligament in my right hand. Then bearing started falling out of the machine so when I used it big chuncks broke off the machine. I can't use it and my need surgery on my hand. I called the company three times and was told someone would call me back. No one did so I wrote to their main office. I never heard back from them. Help! Rose Selber-Union City, Ca. read full review »