The present invention relates to a standup exercise apparatus that simulates walking and jogging with arm exercise. More particularly, the present invention relates to an exercise machine having separately supported pedals for the feet and arm exercise coordinated with the motion of the feet where the pedal stride length is determined by the movements of an operator. Crank arms are positioned on the framework rearward the operator at a height comparable to the pedals. The default mode provides a stepping motion with handles side by side. Allowing the handles to move as desired achieves elliptical curve pedal paths with varying stride length.