The Terra Core Balance Trainer benefits are scientifically proven to engage 4 times more muscle groups than the same exercise on a flat, hard surface. Turns all of your workouts into a three-dimensional, functional sweat fest. The Terra Core is designed to work by itself or with resistance bands, dumbbells, kettlebells, medicine balls, TRX and all other fitness accessories. The bottom side offers push-up handles and other exercises to help build balance and agility.