“Very underused piece of equipment,” Szekretar says. “But it’s ideal if you are recovering from a hip or foot injury,” he adds. Muscles are smaller in the upper body so it may be harder to increase the heart rate but it’s still useful. While this machine may look like a seated safe haven, it provides tough cardio perfect for short intervals. While sitting in a seat, you spin/crank your arms like a bike. The machine is also great for shoulder mobility. It’s a good idea to be included in upper body strength circuits, Szekretar says.