When I was going to the gym and using the tread mill or stepper my hip would kill me. When I started riding, I tried it with a cheap bike and found out that it didn't bother me.

Years ago in service while jumping, I made a bad exit and hit the side of the plane. It didn't bother me all this time, until I started to go to the gym. I went to the doctor and had it x-rayed and that was the results. Besides pain pills for my RA I feel fine now. The bike riding does help as well, good luck.