Whenever a new group exercise program takes off, it’s often because it added synchrony to a typically unsynchronized physical activity, like boxing (Tae Bo), weight lifting (BodyPump), or cycling (SoulCycle). Remove the trappings of any fitness program at its cultural apex, and you’ll find the same ingredients, the same collective joy. As long as our DNA compels us to connect with others, we will continue to seek out places where we can move and sweat together.