Arthritis UCK!

I had some tests run a few weeks ago and went to speak with the doctor today about them. Diagnosis arthritis. I am so stiff sometimes in my knees and elbows it isn't funny. I am worried that this is going to be a debilitating disease. It says it helps to walk and ride a bike. Also to swim, problem is there isn't a pool that I can use. I think I will have to start walking more, and get more exercise. If anyone else has information on what helps please let me know.