During my 3 years at Lesley, as a grad student, they expanded their fitness center, and made it very appealing to the undergrads. There was no extra charge to use it. I did not need to use the gym there, although I thought about it. My first year of school, I still belonged to the ritzy health club I had belonged to for 12 years, and after that, I decided to do all my stuff outside and I bought weights and a treadmill, as well as yoga and functional fitness CDs to use at home. I went to class at night and it just wasn't convenient for me to use the gym before class.
Lesley is a small liberal arts college that focuses on education and counseling/human services/the arts. When I went there as an undergrad (one semester) it was a teacher's college for women, although the grad school has always been co-ed. The undergrad college became co-ed about 10 years ago. They now have division 3 teams in several sports. There are free yoga classes and free bikes to ride.
I really didn't want to be in the gym with a bunch of 18 year olds... at a larger university, I might have considered it, as there would be a wider range of people using the facilities.