If you don't want to be that guy that becomes a giant pussy everytime you have to do 20 pushups, then start training hard now. The DI's have a little card that says exactly how many reps of any excercise they can make you do at a time, and that amount is pretty weak if you come prepared. The OCS PT is a joke if you are in ok shape, and it will be for you too if you start training ahead of time. Get a trainer or join a crossfit gym. Do something where there will be other people to push you past your own limit and you will see how big of a joke OCS really is.