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An exercise apparatus comprises: a frame; a crank system supported by the frame; a right and left foot members supported by the frame; first and second flexible element coupled to the crank system and foot support members such that downward motion of either foot support member causes rotation of the

An exercise apparatus comprises: a frame; a crank system supported by the frame; a right and left foot members supported by the frame; first and second flexible element coupled to the crank system and foot support members such that downward motion of either foot support member causes rotation of the crank system; and a crank offset assembly configured to prevent the crank system from becoming locked at a top dead center location.

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1. An exercise apparatus allowing instantaneously variable striding motions, the exercise apparatus comprising: a frame;a crank system supported by the frame and adapted for continuous rotation, said crank system comprising a crank offset assembly configured to apply offset torque to the crank syste

1. An exercise apparatus allowing instantaneously variable striding motions, the exercise apparatus comprising: a frame;a crank system supported by the frame and adapted for continuous rotation, said crank system comprising a crank offset assembly configured to apply offset torque to the crank system when the crank system is in a dead center position;first and second brake devices;a right foot support member coupled to the frame;a left foot support member coupled to the frame;a first flexible support system comprising: a first flexible element, the first flexible element coupled to the right foot support member and the crank system and operative to rotate the crank system when the right foot support member moves downward; anda second flexible support system comprising: a second flexible element, the second flexible element coupled to the left foot support member and the crank system and operative to rotate the crank system when the left foot support member moves downward,wherein force may be applied by a user to the right and left foot support members permitting the user to vary among a climbing motion and a closed path walking, striding, or jogging motion, the length of the walking, striding, or jogging motion being instantaneously variable by the user as the user varies between a forward and rearward force applied to the foot support members, andwherein the first brake device provides resistance to rotation of the crank system and the second brake device provides resistance to horizontal motion of the foot support member. 2. The exercise apparatus of claim 1 wherein the crank system comprises a crank shaft and two crank arms. 3. The exercise apparatus of claim 1 wherein the right and left foot members are coupled to the frame through one or more linkage members. 4. The exercise apparatus of claim 1 wherein the right and left foot support members are cross coupled by a cross coupling system to provide alternating motion. 5. The exercise apparatus of claim 4 above wherein the cross coupling system is coupled to a brake. 6. The exercise apparatus of claim 1 wherein the first and second flexible elements are selected from the list consisting of: a belt;a cog;a chain; anda cable. 7. The apparatus of claim 1, wherein the first brake device is coupled to the crank system and the second brake device is coupled to the right and left foot support members. 8. The apparatus of claim 1, wherein the crank system is coupled to an inertia device configured to store energy and return energy to a portion of the apparatus. 9. An exercise apparatus allowing instantaneously variable striding motions, the exercise apparatus comprising: a frame;a crank system with an axis of rotation and adapted for continuous rotation, the crank system comprising first and second crank system coupling locations, the crank system supported by the frame;first and second brake devices;a right pivotal linkage assembly comprising a right foot support member, the right foot support member comprising a right foot plate, the right pivotal linkage assembly coupled to the frame;a left pivotal linkage assembly comprising a left foot support member, the left foot support member comprising a left foot plate, the left pivotal linkage assembly coupled to the frame;a first flexible support system comprising a first flexible element operating in tension, the first flexible element coupled to the right pivotal linkage assembly and the first crank system coupling location, wherein a first tension vector defines a first direction of tension in the first flexible element near the first crank system coupling location;a second flexible support system comprising a second flexible element operating in tension, the second flexible element coupled to the left pivotal linkage assembly and the second crank system coupling location, wherein a second tension vector defines a second direction of tension in the second flexible element near the second crank system coupling location; anda crank offset assembly configured so that at least one of the tension vectors does not intersect the axis of rotation of the crank system when one of the right and left foot plates is at a lowest resting position.wherein a user may apply a force to the foot support members so as to undertake a walking, striding, jogging, or climbing motion and may instantaneously alter the length of the walking, striding, or jogging motion by altering the forward and rearward force applied to the foot support members, andwherein the first brake device generally resists vertical motion of the foot plates and the second brake device generally resists horizontal motion of the foot plates. 10. The exercise apparatus of claim 9 wherein the crank system comprises a crank shaft and two crank arms. 11. The exercise apparatus of claim 9 wherein the right and left foot members are coupled to the frame through one or more linkage members. 12. The exercise apparatus of claim 9 wherein the right and left foot support members are cross coupled by a cross coupling system to provide alternating motion. 13. The exercise apparatus of claim 12 above wherein the cross coupling system is coupled to a brake. 14. The exercise apparatus of claim 9 wherein the first and second flexible elements are selected from the list consisting of: a belt;a cog;a chain; anda cable. 15. The apparatus of claim 9, wherein the first brake device is coupled to the crank system and the second brake device is coupled to the right and left foot support members. 16. The apparatus of claim 9, wherein the crank system is coupled to an inertia device configured to store energy and return energy to a portion of the apparatus.