This little bad boy will blow up your calves like no other. The machine actually moves when you move. The movement allows the calf to stretch and contract further than any other calf machine out there. It’s also very comfortable on the arches of the foot. Which in this user’s experience is one of the most important factors, and a deal breaker on whether or not a calf machine is any good. If you can’t do a machine because it hurts you, it’s no good. This machine is really friendly on the feet. Dr. Scholl’s would approve.