I did just that about 11 years ago one summer in community college because I needed a gym credit at college so I took a summer course at night doing Pilates twice a week. Anyway, only 2 guys out of 25 or so in the classes. The one guy had a girlfriend with him in the class taking it together. BUT out of the 25 only 2 hot women, well 3 if included this near 50 year old looking MILF but I was way too young then.
It was ironic I just happen to sit next to the hottest girl in the classes and possibly campus LOL. Perfect 9.5 HB like 22 years old. Tall, blonde German genetic girl. Smoking legs, everything, nice, but shy. But I did classic cold approach one day after class and just flat out asked for her number cause I wanted to see her reaction and she told me to grab my phone and she put her number in it. She already had a BF though because I looked her up on FB before that and already knew but I said F it anyway and wanted to see what she'd do and she gave me her real number. Man, in college it seemed easier to cold approach or chat up class mates. I wish I were in college again. I certainly would have done more activities.