You guys might laugh at this one, but several years ago I was on a fishing trip by myself. Being out of shape (but I didn't think so), I would get winded just walking on flat ground at 7500 feet. I also went to jump over a small meadow creek and ended up standing chest deep in this creek and I had hurt my back in the process. This kind of prodded me into working out again. I live for the summer months and flyfishing (back packing when I can), so I had to do something.
One other point, I love playing bball and I do every Saturday. I couldn't hang any more, so I had to do something.
Once I started lifting, with a personal trainer (actually a really good one), I didn't like the full body workouts every day and wanted to get into bb. Now, I'm 15 pounds heavier and 10% bf less. On my way to a lean 250. On the bball court, there aren't any stronger, even big guys, I can muscle around. Flyfishing, no more huffing and puffing.
I've also noticed that I look a helluva lot better, which is a perk. My wife can't keep her hands off of me......bummer.