I'm VERY confused. I'm not exactly the most athletic person in the world, but even the skinniest, wimpiest girls in my class can do at least 5 reps...WHY CAN'T I MANAGE EVEN ONE? When I flex my arms, I can see muscle. I exercise and do weight training regularly. In fact, I can carry heavier loads than a lot of other girls I know (heck, I can even carry a 100-lb girl, bridal style!). WHAT'S WRONG WITH ME? Why can't I do a single push-up?