Treadmill with intermediate member

A manually powered treadmill, comprising:

• a frame;
• a front rotatable element coupled to the frame;
• a rear rotatable element coupled to the frame;
• and
• a running belt at least partially disposed about the front and rear rotatable elements, wherein the running belt defines a non-planar running surface, and wherein the running belt includes:
• a first endless belt;
• and
• a plurality of slats, each slat coupled to the first endless belt and each slat including a side with a rib projecting from the side thereof, the rib extending longitudinally along at least a portion of the side and having an at least partially convex shape.

A treadmill, comprising:

• a frame;
• a front rotatable element coupled to the frame;
• a rear rotatable element coupled to the frame and spaced apart from the front rotatable element;
• and
• a running belt at least partially disposed about the front and rear rotatable elements, wherein the running belt defines a non-planar running surface, and wherein the running belt includes:
• a first endless belt;
• and
• a plurality of slats, each slat coupled to the first endless belt and each slat comprising a base and a rib projecting from and extending longitudinally on at least a portion of the base of each slat, wherein a thickness of the rib proximate the base is greater than a thickness of the rib in an approximate longitudinal center of the rib.

A treadmill, comprising:

• a frame;
• a front rotatable element coupled to the frame;
• a rear rotatable element coupled to the frame;
• a plurality of bearings coupled to the frame to define at least a portion of a curved top profile, and wherein the plurality of bearings comprise a predefined low viscosity bearing fluid;
• and
• a running belt at least partially disposed about the front and rear rotatable elements and the plurality of bearings, the running belt having a running surface, at least a portion of which follows the curved top profile of the plurality of bearings to define at least a portion of a curved running surface of the running belt,
• wherein a radius of curvature of the curved running surface is in a range of approximately 88 to 138 inches.