Leg-powered treadmill

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

• a treadmill frame;
• said treadmill frame supporting a treadmill running surface;
• said treadmill running surface having a top concave surface, said treadmill running surface being of such a length as compared to the length of said treadmill frame to permit it to assume a required concave upper contour;
• a means for maintaining said treadmill running surface in said required concave upper contour, said treadmill running surface providing a running surface during exertion of walking or running force upon an upper concave portion of said treadmill surface;
• wherein said means for said treadmill running surface is maintained in a concave configuration is a plurality of transverse parallel slats forming a continuous closed loop treadmill belt suspended by a pair of pulleys set apart horizontally at a pre-set distance;
• an upper part of said continuous closed loop maintained in a concave configuration by concave arrays of bearings on each side of the treadmill, forming a slackened drooping upper catenary portion;
• said continuous closed loop treadmill belt having a lower concave portion forming a lower concave contour, forming a slackened drooping upper catenary portion;
• wherein each said upper concave portion and said lower concave portion of said belt forms a respective slackened drooping catenary curve;
• wherein said closed loop treadmill belt is an a closed loop array of said plurality of transverse parallel slats;
• wherein each said transverse slat is made of a material with sufficient resiliency and strength and weight to lie on and conform to a concave row of upper support peripheral bearings located at each peripheral side of an upper concave portion of said treadmill frame of said motor-less, leg-powered curved treadmill;
• said catenary curves of said upper concave portion and said lower concave portion of said belt are maintained in a fixed concavity during the exertion of walking or running force upon said upper concave running surface of said belt.