Five and a half years after my MT, I finally raced again.  I didn't run a tri, my knee and I both don't like running, so I tried an aqua-bike.  You swim and bike, and that's it, so I spare my knees from the repeated pounding of a 210 pound frame training.  So my wife found a race we could both do (she wanted an Olympic distance tri), and we signed up. It was a blast, I placed 2nd overall, and she was second in her age group. 

Still charging.