A slider-crank mechanism whose coupler curve is the approximate ellipse is designed so that a man may perform the pedaling of the elliptical motion of the foot. Because the thigh. the shank and the foot constitute the three-link chain. the system of a man and the bicycle with the slider-crank pedal mechanism is the planar seven-link mechanism with two degree freedom. https://hollandscountryclothinges.shop/product-category/lounge-socks/