Well+Good’s super popular fitness mashup event combines two back-to-back boutique classes at hot studios. After the workouts, everyone heads to the healthy after-party for much-deserved rejuvenation and celebration. The best part? The event raises money for charity. This year, with their biggest biathlon yet in NYC, Katherine is one of the elite Master Trainers that participants will rotate to. To benefit from Katherine's signature moves take a peak HERE.