Created by Sadie Kurzban, 305 Fitness is a fierce dance cardio class with a live DJ. No prior dance experience is required, but you’ll be moving your body nonstop and learning choreography that will help you become a better dancer and build stamina and confidence. This class is 95% cardio, takes place in a dimly lit room that feels more like a nightclub than a gym. Here, you can burn 700+ calories in under an hour while getting lost in the music. Yes, it’s true, there is a LOT of twerking in these classes.