I tried a free workout to see what it was all about. Think personal training and group fitness at the same time while you are "competing" with your group-mates. It was fast-paced and your heart monitor goals display on a screen where going from grey, green then orange to red is very motivating! The goal is to be in Orange to Red zones for maximum EPOC burn. I really enjoyed it!! My first class started with the treadmill then row machine to weights. There are different types of instructions and I was told every time is completely different! I highly recommend giving it a try to see if it's for you!