Athletics are popular for those who care about them. If you have no interest in sports, you will not feel left out at all. The main spectator sports that draw crowds are football and basketball. Of course, every student wants UD teams to win, but support is more abstract, as few students follow the games or know the details of UD sports teams. Intramurals are really big with those who participate in them but seem practically nonexistent to those who don't. Your own preference determines how important sports will be to your college life.
The gym for students is modern and fully equipped. There are fitness classes, personal trainers, and staff to plan a personalized workout for those who cannot plan their own workouts. There are even options like yoga for those who are not so fond of other kinds of exercise. Most students take advantage of some aspect of athletics, whether in team form or on their own, and the gym is always crowded at peak hours.