By providing power to a propeller it can impart motion to the air and can therefore couple human power output to provide propulsion for an airplane. For boats, a propeller used for propulsion can ...

We also use treadmills, but we use them for a different purpose than generating motion through human power. In fact, most treadmills today move using a motor so you can feel like you are running ...

The human power output to the bike is the product of pedal velocity and pedal force. The power output curve is, therefore, peaked over some optimal muscle-flexing range that is related to the velocity ...