Nobody's bringing up the point that it's not that hard to pass the physical tests to get in.
And certainly, you don't need steroids LOL.
This story is in the UK, but, to pass the US marines physical fitness test, he would need, according to web sites:
1.) 3 pull ups
2.) 50 crunches
3.) 3 mile run in 28:00
Plus, you get plenty of chances and they let you work on it, it's hard to get your ass thrown out for that.
dear god.