The EF-300 is the newest most versatile of the Ex N'Flex machines. Working both lower and upper body, the EF-300 offers many of the same features as the original EF-250 Leg Machine. However, this unit is much smaller and allows work with both arms and shoulders, as well as, for the legs. It is imperative to ensure there is no shoulder separation or subluxation prior to utilizing the EF-300 with the arms. EF-300 FEATURES AND SPECIFICATIONS EF-300 FAQ'S VIEW EF 300 / EF150W VIDEO Potential Benefits Strength & Endurance Cardiovascular fitness Flexibility & Range of Motion Circulation Bowel/Bladder function Spasms, Edema Pain & Stiffness Applications Hemiplegia Quadriplegia Multiple Sclerosis Stroke Recovery Parkinson's Disease Alzheimer's Disease Muscular Dystrophy A.L.S. Post Surgical Exercise for the Elderly Cerebral Palsy In Passive Mode , the legs or arms are rotated by the electric motor in orbital motion similar to cycling. In Active Mode , you can assist the motor to move the pedals with your own muscles. The special computer processor allows the machine to adapt to your strength capacity. As you do more work the EF-300 senses this and reduces the amount of work the motor does. Then as you tire the machine picks up the difference and continues to move your legs or arms.