My name is Jamie, I am just out of the Navy because of a problem with my spine. I have a pars defect, but it wasn't aggravated until last year in September. Since then I gained about 60 pounds

, and I am trying to lose again. I get steroid injections in my spine, and they really help, but I have not had an injection since June, and my pain is full time again. I am walking every day, and I am using weights on my wrists when I walk and doing arm exercises, they don't hurt as much as putting the weights on my ankles. And I am using a medicine ball to do a few 2-man exercises with a friend. I just wish I knew some other exercises that I won't kill myself to do.
Any suggestions?