My mom has rheumatoid arthritis and has done the program in the warm water therapy pool for years. She is in her late 60's and in very good health other than the rheumatoid arthritis. She could always tell when she missed a few classes that she was a lot more stiff and sore. This last year she hasn't gone at all because she has retired and been busy with other things. She just had her yearly arthritis checkup and was told that she has lost quite a bit of her range of motion. My mom is postive it is because she has stopped going to the water classes, so she has signed back up and will be making it a priority again.