6 week transformation plan offers unlimited hiit workout sessions in the 6 week period hiitgyms is a energizing group interval fitness concept that is about to sweep the nation it is a one of a kind workout broken into intervals of cardiovascular and strength training using a variety of equipment including treadmills rowing machines trx suspension training and free weights to tone your body and gain energy throughout the day burn up to 1000 calories backed by the science of post exer