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An exercise machine is disclosed. Exemplary embodiments include an exercise machine with a safety brake mechanism to provide a braking force to the exercise machine to stop the exercise machine, an exercise machine with a variable resistance mechanism to variably adjust and provide resistance to the

An exercise machine is disclosed. Exemplary embodiments include an exercise machine with a safety brake mechanism to provide a braking force to the exercise machine to stop the exercise machine, an exercise machine with a variable resistance mechanism to variably adjust and provide resistance to the exercise machine, and an exercise machine with both mechanisms.

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What is claimed is: 1. An exercise machine, comprising: a movable portion engageable by a user, said movable portion having a rigid member; a braking member biased toward said rigid member, said braking member configured to apply a braking force to said rigid member; and a pulling member configured

What is claimed is: 1. An exercise machine, comprising: a movable portion engageable by a user, said movable portion having a rigid member; a braking member biased toward said rigid member, said braking member configured to apply a braking force to said rigid member; and a pulling member configured to be connected to said movable portion to disengage said braking member from said rigid member when said user moves said movable portion, wherein said movable portion includes: a frame having a first axle support and a second axle support; a roller disposed between said first axle support and said second axle support; and an axle extending through said roller and having a portion extending external to said second axle support; wherein said rigid member is connected to said external portion of said axle. 2. The exercise machine of claim 1, wherein said frame includes: an overhead frame including: a first arm; a second arm; a third arm; and a fourth arm; wherein said first axle support is attached to said first arm and extends downwardly perpendicular to said first arm; wherein said second axle support is attached to said second arm and extends downwardly perpendicular to said second arm; wherein a first end of said third arm is attached to said first axle support and a second end of said third arm is attached to said second axle support, said third arm extending horizontally perpendicular to said first and second arms; wherein a first end of said fourth arm is attached to a mid-portion of said third arm and extends upwardly and forwardly from said third arm. 3. The exercise machine of claim 2, wherein said frame further includes: a front frame including: a first arm; a second arm; a first arm extension; a second arm extension; and a cross member; wherein a first end of said first arm of said front frame is attached to a first end of said first arm of said overhead frame, said first arm of said front frame extending forwardly and downwardly from said first arm of said overhead frame, and wherein a first end of said second arm of said front frame is attached to a first end of said second arm of said overhead frame, said second arm of said front frame extending forwardly and downwardly from said second arm of said overhead frame; wherein a first end of said first arm extension is attached to a second end of said first arm of said front frame and wherein a first end of said second arm extension is attached to a second end of said second arm of said front frame; wherein said cross member is attached at a first distal end to a second end of said first arm extension and at a second distal end to a second end of said second arm extension and wherein said cross member extends perpendicularly to said first and second arm extensions. 4. The exercise machine of claim 3, wherein said frame further includes: a rear frame having a first arm and a second arm; wherein a first end of said first arm of said rear frame is attached to a second end of said first arm of said overhead frame, said first arm of said rear frame extending rearwardly and downwardly from said first arm of said overhead frame, and wherein a first end of said second arm of said rear frame is attached to a second end of said second arm of said overhead frame, said second arm of said rear frame extending rearwardly and downwardly from said second arm of said overhead frame; wherein a second end of said first arm of said rear frame is connected to a second end of said second arm of said rear frame. 5. The exercise machine of claim 4, wherein said movable portion further includes: a support member; wherein said support member is attached to a second end of said fourth arm of said overhead frame; wherein said support member is attached to a mid-portion of said cross member below said attachment of said second end of said fourth arm of said overhead frame and extends perpendicular to said cross member. 6. The exercise machine of claim 5, wherein said support member includes one of a wheel and a skid at a first end thereof. 7. The exercise machine of claim 1, wherein said movable portion further includes an extension member attached to said frame, said extension member disposed on an external side of said second axle support and wherein said braking member is connected to said extension member. 8. The exercise machine of claim 1, further comprising: an attachment member connected at one end to said braking member and connected at the other end to said pulling member, said attachment member configured to transmit said braking force to said braking member from said pulling member; and a compression member connected to and engageable with said braking member, said compression member configured to compress as said braking member applies said braking force. 9. The exercise machine of claim 1, wherein said braking member includes a band brake and said rigid member includes a hub, said band brake positioned to surround said hub. 10. An exercise machine, comprising: a movable portion engageable by a user, said movable portion having a rigid member; a braking member biased toward said rigid member, said braking member configured to apply a braking force to said rigid member; a pulling member configured to be connected to said movable portion to disengage said braking member from said rigid member when said user moves said movable portion; a second rigid member adjacent to said rigid member; a resisting member configured to be connected to said second rigid member, said resisting member configured to apply a resistance to said second rigid member; and a variably adjusting member configured to be connected to said resisting member to variably adjust said resistance of said resisting member. 11. The exercise machine of claim 10, further comprising: a housing member configured to connect said resisting member and said variably adjusting member, said housing member being movably positionable above said second rigid member; and a tension member disposed within said housing member and engageable with said resisting member, said tension member configured to compress as said resisting member applies said resistance. 12. The exercise machine of claim 11, further comprising: a counting member connected to said variably adjusting member and configured to measure said resistance on said second rigid member; and a displaying member connected to said counting member and configured to display a value of said resistance. 13. The exercise machine of claim 10, wherein said resisting member includes a band brake and said second rigid member includes a hub, said band brake positioned to surround said hub. 14. The exercise machine of claim 10, wherein said variably adjusting member includes a knob. 15. An exercise machine, comprising: a movable portion engageable by a user, said movable portion having a rigid member; a resisting member configured to be connected to said rigid member, said resisting member configured to apply a resistance to said rigid member as said user moves said movable portion; a variably adjusting member configured to be connected to said resisting member to variably adjust said resistance of said resisting member; and a connecting member configured to connect said resisting member and said variably adjusting member, said connecting member being movably positionable above said rigid member, wherein said movable portion includes: a frame having an overhead frame, a front frame attached to a first end of said overhead frame, a rear frame attached to a second end of said overhead frame, and a first axle support and a second axle support attached to first and second ends, respectively, of said rear frame; a roller disposed between said first axle support and said second axle support; and an axle extending through said roller and having a portion extending external to said second axle support; wherein said rigid member is connected to said external portion of said axle. 16. The exercise machine of claim 15, further comprising: a tension member disposed within said connecting member and engageable with said resisting member, said tension member configured to compress as said resisting member applies said resistance; a counting member connected to said variably adjusting member and configured to measure said resistance on said rigid member; and a displaying member connected to said counting member and configured to display a value of said resistance. 17. The exercise machine of claim 15, wherein said resisting member includes a band brake and said rigid member includes a hub, said band brake positioned to surround said hub. 18. The exercise machine of claim 15, wherein said variably adjusting member includes a knob. 19. An exercise machine, comprising: a movable portion engageable by a user, said movable portion having a rigid member; a resisting member configured to be connected to said rigid member, said resisting member configured to apply a resistance to said rigid member as said user moves said movable portion; a variably adjusting member configured to be connected to said resisting member to variably adjust said resistance of said resisting member; a second rigid member adjacent to said rigid member; a braking member biased toward said second rigid member, said braking member configured to apply a braking force to said second rigid member; and a pulling member configured to be connected to said movable portion to disengage said braking member from said second rigid member when said user moves said movable portion. 20. The exercise machine of claim 19, further comprising: an attachment member connected at one end to said braking member and connected at the other end to said pulling member, said attachment member configured to transmit said braking force to said braking member from said pulling member; and a compression member connected to and engageable with said braking member, said compression member configured to compress as said braking member applies said braking force. 21. The exercise machine of claim 19, wherein said braking member includes a band brake and said rigid member includes a hub, said band brake positioned to surround said hub. 22. The exercise machine of claim 19, wherein said pulling member includes a harness assembly. 23. An exercise machine, comprising: a movable portion engageable by a user, said movable portion having a first rigid member and a second rigid member, said second rigid member adjacent to said first rigid member; a braking member biased toward said first rigid member, said braking member configured to apply a braking force to said first rigid member; a pulling member configured to be connected to said movable portion to disengage said braking member from said first rigid member when said user moves said movable portion; a resisting member configured to be connected to said second rigid member, said resisting member configured to apply a resistance to said second rigid member as said user moves said movable portion; and a variably adjusting member configured to be connected to said resisting member to variably adjust said resistance of said resisting member; wherein said movable portion includes: a frame including: an overhead frame, a front frame attached to a first end of said overhead frame, and a rear frame attached to a second end of said overhead frame, wherein said frame is formed in an inverted u-shape configuration and defines an internal area defined by said overhead frame, said front frame, and said rear frame; a roller attached to a lower end of said overhead frame and disposed within said internal area; an axle extending through said roller and having a portion extending external to said internal area; and a frame extension member attached to said overhead frame and disposed external to said internal area; wherein said first and second rigid members are connected to said external portion of said axle. 24. The exercise machine of claim 23, wherein said braking member includes a first band brake and said first rigid member includes a first hub, said first band brake positioned to surround said first hub. 25. The exercise machine of claim 23, wherein said resisting member includes a second band brake and said second rigid member includes a second hub, said second band brake positioned to surround said second hub. 26. The exercise machine of claim 23, wherein said variably adjusting member includes a knob. 27. The exercise machine of claim 23, wherein said pulling member includes a harness assembly. 28. An exercise machine having an automatic safety mechanism comprising: (a) an elongated roller cylindrical in configuration and rotatable about its longitudinal axis for rolling over ground; (b) a frame, including at least one rigid frame member, with a proximate end rotatably attached to said roller to permit said roller to roll about its axis and a distal end; (c) a brake mechanism including a brake member rigidly affixed to said roller for rotation therewith; (d) a brake engaging member for engaging said brake member to brake rotation of said roller; (e) said brake mechanism further including a bias mechanism for biasing said brake engaging member into engagement with said brake member to brake rotation of said roller; (f) a harness connected to said frame member at said distal end for engagement by a user to pull the frame and roller over ground; (g) said harness being connected to said bias mechanism of the brake mechanism to overcome said bias and release said brake engaging member from engaging said brake member when the exercise machine is being pulled by the user; (h) a variable resistance mechanism connected to said roller independently of said brake mechanism for applying resistance to the rotational movement of said roller; (i) said harness, frame, roller and brake mechanism cooperating to permit the roller to be rolled over a surface by the user for exercise while automatically braking the roller when the user ceases to pull the machine. 29. The exercise machine of claim 1, wherein said pulling member includes a cable that pulls both forward toward said user and rearward from said rigid member in order to disengage said braking member. 30. The exercise machine of claim 1, wherein said pulling member includes a harness assembly. 31. The exercise machine of claim 15, wherein said variably adjusting member is configured to variably adjust said resistance of said resisting member by horizontally moving said resisting member relative to said variably adjusting member.