I suck at reps.
Only because I get bored easily.
That's why I b-boy, it's an exercise that you can do forever without really getting bored.
I don't even try running treadmills anymore, unless I have my own program on the tv, otherwise it's boring.
5 of those hours will probably end up me doing something active, the other 5, just to keep me from falling asleep.
My triceps need work, I have no quarrel about my legs though, my legs, like many others, are naturally toughened.