This machine has 2-cylinders, one for each leg. Each leg's resistance is independent of the other. This machine is very versatile and can be used in many ways. It has also been referred to a Speed Trainer, Pro Runner, Multi-Leg, Quad/Ham, Glute/Hip, Glute Press, Hip Flexor, and Speed Runner.
Hydra-Gym Power Speed Runner - creates explosive force, it is anti-gravity strength training