EB30X Fitness Studio, Chicago

Flanked by mirrors and overseen by a charismatic fitness coach, EB30x Fitness Studio is the destination for those seeking intense, guided workouts. People here don’t train by themselves, but instead enroll in group and personal training sessions. These bands of fitness brothers and sisters usually arrive in search of EB30x's signature Xpressway workout. During quick 45-minute sessions, exercisers use their own bodies for resistance, sweating and laughing together as they rapidly spring between different positions. Curious gymgoers can watch the workout by clicking here, because its high-energy routines generate so much power they actually upload themselves to the Internet by accident.