Why users love this gym? WITH OVER 80 GROUP FITNESS CLASSES A WEEK THERE'S A CLASS FOR EVERYONE. THIS IS A NEW KIND OF GROUP THERAPY. What can I expect to achieve by attending this gym? Mountainside Fitness is designed with you in mind. Push your limits with our premium training equipment, be motivated by others in one of our 80+ group fitness classes per week, or get your heart racing with our state-of-the-art cardio equipment. Relax after your workout in our sauna or steam rooms, then grab a protein-packed smoothie to go at our MCafé. Experience the Mountainside Way. Check club location pages for specific amenities offered at each club.