They would only recommend the machines, but I wanted to freedom also. The machines alone would do it for me. If you don't use the machines the way we did, then it's a piece of cake and you can easily include others in between. But with their method, there is no way... you keep going until you can no longer move. And when you think you're going to rest, your going to another machine. By the time you get to the last machine you feel like you're going to die, pushing yourself to the maximum again. When finish, all you can do is lay down on the floor... and listen