Leg-powered treadmill

1. A motor-less, leg-powered treadmill, with a curved running surface, comprising:

a treadmill frame;

a front shaft and a rear shaft that are each positioned respectively in a front and rear of the treadmill frame and configured for synchronous rotation;

pairs of front and rear pulley rollers attached on opposing ends of the front and rear shafts, respectively;

opposing arrays of bearings, arranged as bearing rails and positioned between the front and rear shafts on opposing peripheral sides of the treadmill frame; and

a closed loop treadmill belt arranged to rotate about the pulley rollers synchronously with rotation of the front and rear shafts, while maintaining contact with the bearing rails;

wherein the closed loop treadmill belt comprises a plurality of parallel transverse slats that are resiliently interconnected to form the curved running surface; and

wherein the bearing rails follow a catenary curve that is inherently defined by a weight of a portion of the closed loop treadmill belt that extends between a 0-degree position of the front and rear pulleys, and a distance between respective central axes of the front and rear shafts.

2. The motor-less, leg-powered treadmill as per claim 1 , wherein each slat of the plurality of parallel transverse slats includes an upper surface, a bottom surface and at least one fin, extending down from the bottom surface.

3. The motor-less, leg-powered treadmill as per claim 2 , wherein the at least one fin extends continuously over substantially an entire length of each of the transverse slats between the opposing peripheral sides of the treadmill frame.

4. The motor-less, leg-powered treadmill as per claim 1 , wherein each of the plurality of parallel transverse slats is made of a material with sufficient resiliency and strength and weight to lie on bearing rails and conform to the catenary curve of the bearing rails.

5. The motor-less, leg-powered treadmill as per claim 1 , wherein each of the plurality of parallel transverse slats comprises a material selected from the group consisting of rubber, plastic and wood.

6. An exercise treadmill comprising:

a treadmill frame;

said treadmill frame supporting a continuous treadmill running surface belt moving over a set of pulleys communicating with said treadmill running surface belt;

said continuous treadmill running surface belt being a closed loop array of a plurality of transverse parallel slats,

wherein each said transverse parallel slat includes at least one fin descending downward from each said transverse slat, said at least one fin of each said slat extending perpendicular down from each said slat.

7. The exercise treadmill as per claim 6 , wherein the at least one fin extends continuously over substantially an entire length of each of the transverse slats between the opposing peripheral sides of the treadmill frame.

8. A motor-less, leg-powered curved treadmill comprising:

a treadmill frame having opposing upper portions at peripheral sides of the treadmill frame;

a concave row of upper support peripheral ball bearings located at each of the peripheral left and right sides of the treadmill frame; and

a set of respective front and rear pulley end rollers for rotation;

a closed loop treadmill belt, wherein said front and rear pulley end rollers support said closed loop treadmill belt;

wherein said closed loop treadmill belt comprises a plurality of parallel transverse slats, each said parallel transverse slat oriented parallel to an axis of rotation of said belt and attached to each other in a resilient fashion; and

wherein each said transverse slat includes at least one fin descending downward from each said transverse slat and formed with a material with sufficient resiliency, strength and weight to lie on and conform to the respective concave rows of the upper support peripheral ball bearings.

9. The motor-less, leg-powered curved treadmill as in claim 8 , wherein each said rows of peripheral ball bearings are spaced apart from each other on the respective left and right sides of said treadmill frame, wherein said fins of said transverse slats extend cantilevered downward into a vacant mid-section of said treadmill from each said transverse slat and wherein said resiliency enables said transverse slats to dip slightly under the weight of the user runner without any lower support below non-peripheral mid-sections of said transverse slats.

10. The motor-less, leg-powered treadmill as per claim 8 , wherein each of the plurality of parallel transverse slats comprises a material selected from the group consisting of rubber, plastic and wood.