So, I've been doing some parkour. Really wish it were a thing when I was younger, but it's right up my alley as I was a gymnast and diver (springboard, not deep sea) before the running thing caught on for me. Don't really see too many 41-year-old guys doing it though, and I can't get over the feeling that it appears I'm showing off, but I try to do it in the most private places possible. Anyway, it's a blast.