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A walking/jogging exercise machine includes a frame supported upon a generally horizontally extending floor, and a main driveshaft mounted for rotation on the frame. A pair of cams is mounted for rotation on the driveshaft, and a pair of first track assemblies is fixed to the frame. A pair of second

A walking/jogging exercise machine includes a frame supported upon a generally horizontally extending floor, and a main driveshaft mounted for rotation on the frame. A pair of cams is mounted for rotation on the driveshaft, and a pair of first track assemblies is fixed to the frame. A pair of second track assemblies is rotatably attached to the frame and includes brackets having first rollers which ride upon the peripheries of the cams. A pair of non-aligned, foot assemblies are mounted for sliding movement on the first and second track assemblies. A linkage arrangement is provided between the drive shaft and the foot assemblies for transferring the movement of the foot assemblies to the cams so as to produce a change in the angle of a user's ankle which will result in a natural walking/jogging motion.

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1. A walking/jogging exercise machine comprising:a frame supported upon a generally horizontally extending floor;a drive shaft mounted for rotation on the frame;a pair of cams mounted for rotation on the drive shaft;a pair of first track assemblies fixed to the frame;a pair of second track assemblie

1. A walking/jogging exercise machine comprising:a frame supported upon a generally horizontally extending floor;a drive shaft mounted for rotation on the frame;a pair of cams mounted for rotation on the drive shaft;a pair of first track assemblies fixed to the frame;a pair of second track assemblies pivotally attached to the frame and including brackets having first rollers which ride upon peripheries of the cams;a pair of non-aligned, foot assemblies mounted for sliding movement on the first and second track assembly; anda linkage arrangement between the drive shaft and foot assemblies for transferring movement of the foot assemblies to the cams so as to produce a change in the angle of a user's ankle which will result in a natural walking/jogging motion. 2. The exercise machine of claim 1, wherein the frame includes a base member, a pair of vertical uprights connected to the base member, and a rearwardly angled support member joined to the base member. 3. The exercise machine of claim 2, wherein a circular drive pulley is mounted for rotation on the drive shaft between the cams. 4. The exercise machine of claim 3, wherein a brake assembly is mounted forwardly of the vertical uprights and is entrained with the drive pulley by a drive belt. 5. The exercise machine of claim 4, wherein the frame carries an electronic controller connected to the brake assembly for providing resistance to the drive shaft. 6. The exercise machine of claim 1, wherein the first track assemblies take the form of downwardly and forwardly declined, rear guide shaft assemblies disposed at an angle of about 10 degrees relative to the floor. 7. The exercise machine of claim 1, wherein the second track assemblies take the form of front guide shaft assemblies, each including a cylindrical tube connected to a bifurcated bracket for holding one of the first rollers which rides upon the cam periphery. 8. The exercise machine of claim 7, wherein the cylindrical tube pivots through an angular range of about 5 to 10 degrees relative to the floor. 9. The exercise machine of claim 6, wherein each foot assembly includes a foot pedal mounted upon a support bar having a rearward end attached to a carriage assembly which rides back and forth on one of the rear guide shaft assemblies. 10. The exercise machine of claim 7, wherein each foot assembly includes a forward, lower end equipped with a roller which rolls back and forth along the cylindrical tube of the front guide shaft assembly. 11. The exercise machine of claim 9, wherein the carriage assembly includes a pair of side plates for holding a pair of upper rollers which ride on an upper surface of the rear guide shaft assembly, and a lower roller which rides on a lower surface of the rear guide shaft assembly. 12. The exercise machine of claim 11, wherein an adjustment device for changing the position of the rollers is provided on the carriage assembly. 13. The exercise machine of claim 2, wherein a pair of swing arms is pivotally connected to an upper portion of the support member and carries a pair of handles fixed thereto. 14. The exercise machine of claim 2, wherein the support member carries a pair of hand grips fixed thereto. 15. The exercise machine of claim 1, wherein the linkage arrangement includesa pair of bell cranks attached at one end to the drive shaft,a pair of forward connecting links, each having a first end pivotally connected to another end of one of the bell cranks, and a second end pivotally connected to a mid portion of one of the swing arms, anda pair of rear connecting links, each having a first end pivotally secured to a bottom end of one of the swing arms, and a second end pivotally connected to one of the carriage assemblies. 16. A method of walking/jogging in an exercise machine, the method comprising the steps of:providing a frame supported on a generally horizontally extending floor;mounting a drive shaft rotation on the frame;mounting a pair of cams for rotation on the drive shaft;fi xing a pair of first track assemblies to the frame;rotatably mounting a pair of second track assemblies to the frame such that the second track assemblies have brackets for holding first rollers which ride upon the peripheries of the cams;mounting a pair of non-aligned, foot assemblies for sliding movement on the first and second track assembly; andproviding a linkage arrangement between the cams and foot assemblies for transferring movement of the foot assemblies to the cams so as to produce a change in the angle of a user's ankle which will result in a natural walking/jogging motion.