Counting

Counting 1-100 sequentially is very daunting. Counting to five is easy as pie. I do 5 reps a set in my head and count 5 sets of 5 reps as 1. I start over with the sets of 5 and hit 50 at the end. So four groups of 5 sets of 5 push-ups equals 100. Counting to five involves the five numbers that you're constantly repeating in your head opposed to using more of your mind. That would be 100 numbers in your head. An emptier mind is easier to focus.