| 摘要 |
<p>A muscle toning, strengthening or exercising machine has an arm provided with grips or other body-engaging members and swingable about an axis defined by a shaft to which the arm is coupled. This shaft is connected to another shaft by a transmission having a selected transmission ratio and the other shaft is connected to an electric motor which controls the force supplied for exercising, e.g. via a crank mechanism.</p> |
