Some guys were very outgoing and friendly. Some were quiet and reserved. Some were great guys. Some were jerks.
And the same goes for the athletes.
They are students. They go to class, take tests, go to parties, hang out, like everyone else. The only big difference is the huge time committment that their sport demands. But I can remember watching a lab partner play basketball on TV in New York one evening and then sitting next to him in embryology lab the next morning.