"Research in resistance training has shown this for some years:
1-6 repetitions create strength
8-12 reps foster muscular growth
15+ reps build muscular endurance
In other words, if you want to get stronger, add weight. And as a result, reduce repetitions. (A repetition is one full movement of the exercise.) If you train with high repetitions, guess what: You really won't get stronger at all."
Yikes! Someone better tell that to the military, apparently all those pushups and pullups aren't making soldiers stronger at all.