Fitness and Exercise

[XanBcoo]

Pullups are primarily a back exercise...

Edit: Chin-ups focus more on biceps.
Edit: And if you're recommending doing 100 pushups, it becomes primarily a cardiovascular exercise, and I'd advocate doing that early in the morning before eating. There's a lot of controversy around when it's best to do cardio, but that's what I've found most beneficial for me.

But as far as strength building goes, pushups are awful. Basically what Archangel said is true.

It's 50/50 if you ask me, you can't tell me you'll build any significant muscle with a high rep ( 15+ ) and cardio routine even if you keep a high proteins and carb diet.

Once you get past a certain number of reps, you're not really tearing and building any muscle, just working out your lungs. You're not going to get any stronger doing a shit load of pushups. But perhaps that's your goal.