He said to take up a sport that you love. Rock climbing is my passion as well but most certainly not for everyone. I am in much better shape now that I am a rock climber than before because of two reasons I do it a lot, and any outside trip is a hike with heavy gear. I honestly cannot stop thinking about my next climb and that is the kind of thing that will bring you fitness as a side effect.

If you love (insert sport/fit activity that you cannot stop thinking about) then do that and be super fit because you love it. That was the op's point.

22 miles on a treadmill. Talk about boring, I do not understand how you can manage this. Now running outside is another story entirely but stationary bikes/treadmills/elipticals I cannot understand.

Runners get high like few people can: http://www.google.com/search?q=site%3Anews.ycombinator.com%2...

All on their own supply. ;)