Pistons take it to the max.
"I love the pistons. The standard Maxiclimber is a great workout, but if you really want to pound it and get a super workout, get the pistons. I can push my heart rate to maximum BPM and at the same time, get in a great strength training session. The machine has improved my hill climbing on my road bike. Upper body endurance has also improved. I can do more reps on the weight machine. This is a serious piece of training equipment for the serious athlete."