Exercise machine tension system

1. A tension system for an exercise machine, comprising:

an exercise machine having a frame and a movable carriage, wherein said frame includes a first end and a second end, and wherein said movable carriage is movably positioned upon said frame and adapted for reciprocating movement between said first end and said second end of said frame during execution of an exercise; and

a plurality of tension units attached to said exercise machine and operatively engaged with said movable carriage, wherein said plurality of tension units are positioned side-by-side between a first rail and a second rail of said exercise machine, wherein said plurality of tension units are positioned below a lower surface of said moveable carriage, wherein said plurality of tension units jointly provide a linear resistance to movement of said movable carriage in a first direction, wherein a level of said linear resistance is determined by the number of said plurality of tension units operatively engaged with said movable carriage, wherein said linear resistance is increased by operatively engaging additional tension units to said movable carriage, and wherein each of said tension units is comprised of:

a reel;

a flexible member wound around said reel, wherein a first end of said flexible member is connected to said reel and a second end of said flexible member is removably attached to said movable carriage; and

a torsion spring secured to said reel such that said torsion spring exerts resistance on rotation of said reel as said flexible member is unwound from said reel.

2. The tension system for an exercise machine of claim 1 , wherein said plurality of tension units are each vertically oriented.

3. The tension system for an exercise machine of claim 1 , wherein said flexible members of said plurality of tension units extend parallel with respect to each other.

4. The tension system for an exercise machine of claim 1 , wherein each of said plurality of tension units is further comprised of a housing, wherein said reel is rotatably positioned within said housing.

5. The tension system for an exercise machine of claim 4 , wherein said housing includes an opening through which said second end of said flexible member extends.

6. The tension system for an exercise machine of claim 4 , wherein a first end of said torsion spring is secured to said reel and a second end of said torsion spring is secured to said housing.

7. The tension system for an exercise machine of claim 1 , wherein said movable carriage includes a retainer and wherein each of said plurality of tension units is further comprised of an attachment member connected to said second end of said flexible member, wherein said attachment member is adapted to be removably connected to said retainer of said movable carriage.

8. The tension system for an exercise machine of claim 1 , wherein said torsion spring is comprised of a coil spring.

9. A tension system for an exercise machine, comprising:

an exercise machine having a frame and a movable carriage;

wherein said frame includes a first end and a second end;

wherein said movable carriage is movably positioned upon said frame adapted for reciprocating movement between said first end and said second end of said frame during execution of an exercise; and

a plurality of tension units attached to said exercise machine;

wherein each of said plurality of tension units includes a reel and a flexible member having an elongated structure that is operatively engaged with said movable carriage, wherein said flexible member is wound around said reel;

wherein said plurality of tension units are positioned side-by-side between a first rail and a second rail of said exercise machine;

wherein said plurality of tension units are positioned below a lower surface of said movable carriage;

wherein said plurality of tension units jointly provide a linear resistance to movement of said movable carriage in a first direction;

wherein a level of said linear resistance is determined by the number of said plurality of tension units operatively engaged with said movable carriage;

wherein said linear resistance is increased by operatively engaging additional tension units to said movable carriage.

10. The tension system for an exercise machine of claim 9 , wherein each of said tension units is comprised of:

wherein a first end of said flexible member is connected to said reel and a second end of said flexible member is removably attached to said movable carriage; and

a torsion spring secured to said reel such that said torsion spring exerts resistance on rotation of said reel as said flexible member is unwound from said reel.

11. The tension system for an exercise machine of claim 10 , wherein said torsion spring is comprised of a coil spring.

12. The tension system for an exercise machine of claim 9 , wherein said frame includes a first rail and a second rail spaced apart, wherein said plurality of tension units are positioned side-by-side between said first rail and said second rail.

13. The tension system for an exercise machine of claim 9 , wherein said plurality of tension units are each vertically oriented.

14. The tension system for an exercise machine of claim 9 , wherein said flexible members of said plurality of tension units extend parallel with respect to each other.

15. The tension system for an exercise machine of claim 9 , wherein said tension system further comprises a housing having an opening, wherein said reel is rotatably positioned within said housing and wherein said flexible member extends through said opening.

16. The tension system for an exercise machine of claim 10 , wherein said movable carriage includes a retainer and wherein each of said plurality of tension units is further comprised of an attachment member connected to said second end of said flexible member, wherein said retainer is adapted to removably receive said attachment member of said flexible member.

17. The tension system for an exercise machine of claim 16 , wherein said retainer is comprised of a plate having a plurality of receiver slots adapted to removably retain said attachment member.

18. A tension system for an exercise machine, comprising:

an exercise machine having a frame and a movable carriage, wherein the frame includes a first end and a second end;

wherein the frame includes a first rail and a second rail distally spaced apart, wherein the movable carriage is movably positioned upon the first rail and the second rail, wherein the movable carriage is adapted for reciprocating movement between the first end and the second end of the frame during execution of an exercise; and

a plurality of vertically oriented tension units attached to the exercise machine;

wherein each of the tension units is comprised of:

a reel;

a flexible member wound around the reel,

wherein a first end of the flexible member is connected to the reel and a second end of the flexible member is removably attached to the movable carriage,

wherein the flexible member has an elongated structure that is operatively engaged with the movable carriage,

and wherein the flexible members of the plurality of tension units extend from their respective reels in a direction that is parallel to each other; and

a torsion spring secured to the reel such that the torsion spring exerts resistance on rotation of the reel as the flexible member is unwound from the reel;

wherein the plurality of tension units are positioned side-by-side between the first rail and the second rail of the exercise machine and below a lower surface of the movable carriage;

wherein the plurality of tension units jointly provide a linear resistance to movement of the movable carriage in a first direction;

and wherein the level of the linear resistance is determined by the number of the plurality of tension units operatively engaged with the movable carriage and the linear resistance is increased by operatively engaging additional tension units to the movable carriage.

19. The tension system for an exercise machine of claim 18 , wherein said torsion spring is comprised of a coil spring.