Think college campuses are just about the classrooms? Think again. We visited some of Boston’s best campus gyms, and what we found—juice bars, lazy rivers, climbing walls, and kayak rentals—will make wish you could have stayed in college forever.

Northeastern University Marino Center

If you’ve ever driven down Huntington Avenue, you’ve seen the stunning glass facade of the Marino Center. Built around a spacious, airy atrium, the gym contains two state-of-the-art fitness floors, basketball courts, several group fitness and martial arts studios, and a “Treadwall” that simulates rock climbing. This fall, the school added Revolutionz, a high-tech cycling studio complete with flashing lights, a professional sound system, and flat screen TVs for a sensory-overload workout.