. A crankshaft for an elliptical exercise machine, said elliptical exercise machine having a frame, a stanchion and a driving wheel both mounted in front of said frame, a guide rail mounted behind said frame, a link bar connected with an axle of said driving wheel to be synchronously moved together with said driving wheel, said crankshaft being pivotally connected with a distal end of said link bar and comprising:
a linking member having a head portion and a body portion, said head portion being pivotally connected with said link bar, said body portion having a pivoting portion;
a foot support bar having a pivoting part at a front section thereof and mounted on said guide rail at a distal end thereof; and
a slide member mounted between said pivoting portion of said linking member and said pivoting part of said foot support bar to be mounted in said pivoting part, whereby said linking member, said foot support bar, and said slide member are pivotally connected with respect to one another.