Haha love the last pic. Jealous of your backyard setup. Someday, someday... A local forest park actually used to have this "Vita Life" course complete with pull-up bars and rings that you could stop and work out at as you made a running circuit around the trails. They were degraded even when I was a kid, but it would be a really hot spot for some people if they were renovated now. I would consider doing it, even!