This is a tremendous calf machine. It’s all about the stretch on this one. When your at the bottom of the range of motion, with your toes pointed to you, all the fibers on the backside of your calves are rippeling and quivering. The concentric (straightening out) of your foot is almost like a bonus. It’s also tough to find calf machines that don’t overly tax the bottom of the feet and arhes, limiting what we can do. This one is good in that regard. Which is important.