See if you can find an adult Ed class at a local high school. Many years ago, I was a runner but hurt my back and couldn't run. I learned to swim in adult Ed and loved it so much that I started doing triathlons

I guess I should add that I was pregnant at the time and had planned on running throughout my pregnancy. I was kind of obsessed with running so after I had the baby i went back to running and swimming and bought a bike! Now I'm older , have had two knee Replacements and back surgery and I walk!