Was clicking around the CNN/Sanjay Gupta fitness site, and found this interesting piece in the expert Q&A How can someone with arthritis work out?It turns out that some of the myths around arthritis prevent those with the ailment from exercising, out of fear of making their symptoms worse.  It is true that one needs to avoid the pounding of some exercises, so they recommend stationary bicycle with some resistance training as well.  I might add the suggestion of swimming, if you have the facilities to do that.  A little bit of weight loss can make a big difference to arthritis sufferers who have pain in the lower joints.According to the article, your goal will be 30 minutes of cardio 5 times per week, and two days of intense resistance training.  I’d agree as a goal, but for starters, two days at 20 minutes would be good, and one day of resistance training.  Build up slowly, and add a third day of cardio after three months, and after six months a fourth day, and another day of resistance training.Of course also be sure to do extensive stretching during a slow warmup, and slow warmdown after you are done.  This goes double for someone with arthritis.