Varibike’s setup allows riders to use arm power, leg power or a combination of both, increasing the maximum power output and exercising the whole body.
Varibike is an arm and leg-powered bicycle and feature both a traditional leg-powered drivetrain, and a handlebar stem-mounted set of cranks that the rider turns with their arms. That arm power is transmitted from those cranks down to the main drivetrain via a rubber-sheathed chain drive. This setup allows the rider to cruise along using leg power only, arm power only, or a combination of both.
A study of the New Mexico State Univerity showed that (at the same heart rate) the maximum power output could be increased by over 30% using combined arm-and-leg cranking compared with normal cycling.
Furthermore, Varibiking exercises your whole body. Besides your legs you also exercise your arms, chest, shoulders, back and torso. The impact on the fitness and the physique is correspondent high. You move from A to B and you practically have your own gym with you. Simple and effective, especially as it gets.