An exercise apparatus includes a frame; a front crank rotatably mounted on
the frame; a rear crank rotatably mounted on the frame; left and right
rails rotatably interconnected between respective portions of the front
crank and respective portions of the rear crank; left and right foot
supports movably mounted on respective rails; left and right rocker links
pivotally mounted on the frame and operatively, connected to respective
foot supports; and left and right drive links movably interconnected
between respective front cranks and respective rocker links. The resulting
assembly constrains the rails to move through respective circular paths
relative to the frame, and constrains the foot supports to move back and
forth relative to the rails in a manner that generates elliptical foot
paths.
