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. Adjustable tracks are provided to vary the orientation of the pedal path for different intensity exercise. Further, the exercise apparatus is less complex than previous user defined motion elliptical apparatus.