I think Wally is correct about institutional size. One note about the open-to-all fitness center at Wabash is that it mixes the intercollegiate athletes and all others who use the center. When the indoor athletic facilities were redone about 10 years ago there was a pretty prolonged discussion about whether to "give" athletes a separate space. Both money and philosophy of how students should interact said no.
One thought about the open-to-all fitness center is that it obviously mixes all types of people. Generally speaking, intercollegiate athletes tend not to see themselves as special, and others using the facility tend not to look at them as requiring special treatment. On a small campus this can be important. The mixing also tends, I believe, to have something to do with the way the Wabash student body supports intercollegiate teams. Anyone who has been to Wabash knows about that support, which is quite diffferent from what happens on many campuses. And since faculty and staff also share the space, there is plenty of interaction with and observation of varsity athletes while they train-- and a lot of conversation. The fact that Wabash is all male also helps create bonds, of course, and even sometimes a kind of (unfortunate) arrogance that contributes to student backing of athletes. But the fitness center plays a huge role in the way the campus parts contribute to a support for teams.