Earlier quoted context omitted.
There's more to lifting than counting while sitting down! Strength training that has a focus on powerlifting and Olympic lifting are very different than the bodybuilding focus that tends to pervade most gyms. CrossFit is something to check out if you want more fun strength training.
I apologize, I was being dismissive. I wasn't trying to say that weightlifting/bodybuilding/etc lacked meaning or were inferior, just that the motivations are different, and for me personally the intrinsic motivation of them (this muscle needs to be worked out, then this one, etc...) doesn't work as well for me as the extrinsic motivation (I'm going to finish this problem today) of climbing.
Basically, bodybuilding is concerned with aesthetics, while the strength sports are concerned with performance. When I train, my motivation comes from the challenge. Can I deadlift 405 for 5 reps? Can I hit a new personal record of 435? It's a question of raw capability: what are the limits of what I can do? When you get into high rep rangs with compound movements, it becomes an issue of anaerobic endurance: can I squat 235 for 20 reps, or will the pain and exhaustion be too much?