Power generating manually operated treadmill

1. A manually operated treadmill, comprising:

a running belt defining a non-planar running surface;

an electrical power generator coupled to the running belt and adapted to convert rotational motion of the running belt into electrical power;

a height adjusting motor electrically powered by the electrical power generator; and

at least one height adjustable foot coupled to the height adjusting motor, the at least one height adjustable foot being adapted to alter a relative incline of at least a portion of the running belt in response to operation of the height adjusting motor;

wherein a rotational speed of the running belt is controllable by a user's relative position longitudinally forward or rearward on the non-planar running surface.

2. The manually operated treadmill of claim 1 , wherein the rotational speed of the running belt is adapted to increase in response to the user moving longitudinally forward on the non-planar running surface relative to a longitudinally central portion of the non-planar running surface.

3. The manually operated treadmill of claim 1 , wherein the rotational speed of the running belt is adapted to decrease in response to the user moving longitudinally rearward on the non-planar running surface relative to a longitudinally central portion of the non-planar running surface.

4. The manually operated treadmill of claim 1 ,

wherein the non-planar running surface includes a front portion, a central portion, and a rear portion; and

wherein the central portion is relatively closer to a support surface for the manually operated treadmill than the front and rear portions.

5. The manually operated treadmill of claim 1 , further comprising a battery coupled to the electrical power generator and adapted to store the electrical power produced by the electrical power generator as a result of rotation of the running belt.

6. The manually operated treadmill of claim 1 , further comprising:

a treadmill frame having a front end and a rear end opposite the front end;

a front shaft coupled to the treadmill frame at or near the front end; and

a rear shaft coupled to the treadmill frame at or near the rear end;

wherein the running belt is disposed about the front and rear shafts.

7. The manually operated treadmill of claim 1 , further comprising:

a treadmill frame having a front end and a rear end opposite the front end;

a front running belt pulley coupled to the treadmill frame at or near the front end; and

a rear running belt pulley coupled to the treadmill frame at or near the rear end;

wherein the running belt is disposed about the front and rear running belt pulleys.

8. The manually operated treadmill of claim 1 , further comprising:

a treadmill frame having a front end and a rear end opposite the front end;

a front shaft assembly coupled to the treadmill frame at or near the front end; and

a rear shaft assembly coupled to the treadmill frame at or near the rear end;

wherein the running belt is disposed about the front and rear shaft assemblies.

9. A manually operated treadmill, comprising:

a treadmill frame;

a support member coupled to the treadmill frame;

a running belt adapted for rotation about the support member, the running belt having a running surface upon which a user may run;

an electrical power generator coupled to the running belt and adapted to convert rotational motion of the running belt into electrical power;

a power transfer belt adapted to couple the support member to the electrical power generator so that rotational movement of the running belt is transferred to the support member and in turn transferred to the electrical power generator; and

a one way bearing coupled to the support member and adapted to permit rotation of the power transfer belt relative to the support member;

wherein a rotational speed of the running belt is controllable by a relative position of the user longitudinally forward or rearward on the running surface.

10. The manually operated treadmill of claim 9 , wherein the rotational speed of the running belt is adapted to increase in response to the user moving longitudinally forward on the running surface relative to a longitudinally central portion of the running surface.

11. The manually operated treadmill of claim 9 , wherein the rotational speed of the running belt is adapted to decrease in response to the user moving longitudinally rearward on the running surface relative to a longitudinally central portion of the running surface.

12. The manually operated treadmill of claim 9 , wherein the running surface is curved such that the running surface includes a front portion, a central portion, and a rear portion, wherein the central portion is relatively closer to a support surface for the treadmill frame than the front and rear portions.

13. The manually operated treadmill of claim 9 , wherein the running surface is non-planar.

14. A manually operated treadmill, comprising:

a treadmill frame having a front end and a rear end opposite the front end;

a front running belt pulley coupled to the treadmill frame at or near the front end;

a rear running belt pulley coupled to the treadmill frame at or near the rear end;

a running belt disposed about the front and rear running belt pulleys, the running belt adapted for rotation about the front and rear running belt pulleys;

an electrical power generator coupled to the running belt and adapted to convert rotational motion of the running belt into electrical power;

a height adjusting motor coupled to the treadmill frame and electrically powered by the electrical power generator; and

at least one height adjustable foot coupled to the treadmill frame and the height adjusting motor, the at least one height adjustable foot adapted to alter a relative incline of at least a portion of the running belt in response to operation of the height adjusting motor;

wherein a rotational speed of the running belt is controllable by a relative position of the user longitudinally forward or rearward on a running surface of the running belt.

15. The manually operated treadmill of claim 14 , wherein the rotational speed of the running belt is adapted to increase in response to the user moving longitudinally forward on the running surface relative to a longitudinally central portion of the running surface.

16. The manually operated treadmill of claim 14 , wherein the rotational speed of the running belt is adapted to decrease in response to the user moving longitudinally rearward on the running surface relative to a longitudinally central portion of the running surface.

17. The manually operated treadmill of claim 14 , wherein a running surface of the running belt is curved.

18. The manually operated treadmill of claim 14 , wherein a running surface of the running belt is non-planar.

19. The manually operated treadmill of claim 14 , further comprising a battery coupled to the electrical power generator and adapted to store the electrical power produced by the electrical power generator as a result of rotation of the running belt.

20. A method, comprising:

providing a manually powered treadmill, the manually powered treadmill having a frame with a front end and a rear end;

providing a running belt adapted for rotational motion relative to the frame and which, at least in part, defines a non-planar running surface;

providing an electrical power generator coupled to the running belt and adapted to convert the rotational motion of the running belt into electrical power;

providing a height adjusting motor coupled to the treadmill frame and electrically powered by the electrical power generator; and

providing at least one height adjustable foot coupled to the treadmill frame and the height adjusting motor, the at least one height adjustable foot adapted to alter a relative incline of at least a portion of the running belt in response to operation of the height adjusting motor;

wherein the non-planar running surface is configured such that a speed of the rotational motion of the running belt is controllable by a user's relative position longitudinally forward or rearward along the non-planar running surface.