"Failure will never overtake me if my determination to succeed is strong enough" (Og Mandino 1923-1996)
Although for me dancing is the best way of keeping mind and body fit and healthy, for anyone who has just chosen to make the move from couch potato to active mover, walking is the easiest way to begin.
When I was discharged from hospital 3 days after major spinal surgery, I was handed a sheet on Activity Guidelines following Spinal Surgery. The message regarding exercise that I took away from my reading was basically that walking, including using stairs, was the only exercise activity permissible until the 6 week follow up appointment ... and that it was really important to walk, a lot.