The Fitness Equation at One Loudoun is Your Solution For Fitness. We opened our doors January 2016, welcoming our members to the 41,000 SF space, complete with luxury amenities and high-end features including Functional Training, a Group Exercise Studio featuring a Pilates, Yoga and Barre Room, Cycling Studio, NBA-Sized Basketball and Volleyball Courts, Indoor Rock Climbing Wall with Auto-Belay, 3,250 SF Kidz Gym, Kidz Ninja Warrior Course and access to Evolve Salon & Spa.