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A linear motion synchronizing mechanism is for an exercise assembly having elongated first and second rocker arms that pivot with respect to each other about a first pivot axis. A first roller is retained on a first roller supporting member and a second roller retained on a opposing second roller su

A linear motion synchronizing mechanism is for an exercise assembly having elongated first and second rocker arms that pivot with respect to each other about a first pivot axis. A first roller is retained on a first roller supporting member and a second roller retained on a opposing second roller supporting member. The first and second rollers are configured to roll along opposite sides of a linear frame member as the body moves in the first and second directions. A tensioner applies a tensioning force between the first roller supporting member and second roller supporting member so that compression forces are applied on the first and second rollers. The compression forces cause the first and second rollers to mechanically resist pivoting of the first and second rocker arms with respect to each other about the first pivot axis.

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1. A linear motion synchronizing mechanism for an exercise machine having elongated first and second rocker arms that pivot with respect to each other about a first pivot axis, the linear motion synchronizing mechanism comprising: a body that is configured to move along a linear frame member of the

1. A linear motion synchronizing mechanism for an exercise machine having elongated first and second rocker arms that pivot with respect to each other about a first pivot axis, the linear motion synchronizing mechanism comprising: a body that is configured to move along a linear frame member of the exercise machine, the linear frame member extending along a linear axis that is perpendicular to the first pivot axis, wherein the body comprises a first roller supporting member and an opposing second roller supporting member;a hub on the body, the hub being configured to pivotally couple the first and second rocker arms to the body such that pivoting of the first and second rocker arms with respect to each other causes the body to move in a first direction along the linear axis and such that opposite pivoting of the first and second rocker arms with respect to each other causes the body to move in an opposite, second direction along the linear axis;a first roller retained on the first roller supporting member and a second roller retained on the opposing second roller supporting member, wherein the first and second rollers are configured to roll along opposite sides of the linear frame member as the body moves in the first and second directions; anda tensioner that applies a tensioning force between the first roller supporting member and second roller supporting member so that compression forces are applied on the first and second rollers, the compression forces causing the first and second rollers to mechanically resist pivoting of the first and second rocker arms with respect to each other about the first pivot axis. 2. The linear motion synchronizing mechanism according to claim 1, wherein the tensioning force pulls the first and second roller supporting members towards each other so that the compression forces are generated by the first and second rollers being forced against the opposite sides of the linear frame member. 3. The linear motion synchronizing mechanism according to claim 1, wherein the first roller is connected to the first roller supporting member by a first axle, wherein the second roller is connected to the second roller supporting member by a second axle, and wherein the compression forces are transversely oriented to and act on the first and second axles when the first and second rollers are compressed onto the opposite sides of the linear frame member. 4. The linear motion synchronizing mechanism according to claim 2, wherein the tensioner comprises a bolt having threads, the bolt extending through one of the first and second roller supporting members and connecting to the other of the first and second roller supporting members, wherein tightening the bolt increases the tensioning force by pulling the first and second roller supporting members towards each other and wherein loosening the bolt decreases the tensioning force. 5. The linear motion synchronizing mechanism according to claim 4, wherein the bolt is one of a plurality of bolts located on opposite corner portions of the first and second roller supporting members, each bolt in the plurality of bolts having threads and extending through the one of the first and second roller supporting members and connecting the other of the first and second roller supporting members, wherein tightening of each bolt increases the tensioning force by pulling the first and second roller supporting members towards each other and wherein loosening the bolt decreases the tensioning force. 6. The linear motion synchronizing mechanism according to claim 5, comprising a third roller supporting member, a third roller retained on the third roller supporting member, an opposing fourth roller supporting member, and a fourth roller retained on the opposing fourth roller supporting member; wherein the first, second, third and fourth roller supporting members are each configured to be located on a different side of the linear frame member, respectively, such that the first roller supporting member is located opposite the second roller supporting member with respect to the linear frame member and such that the third roller supporting member is located opposite the fourth roller supporting member with respect to the linear frame member. 7. The linear motion synchronizing mechanism according to claim 6, wherein the first roller is one of a pair of rollers on the first roller supporting member and wherein the second roller is one of a pair of rollers on the opposing second roller supporting member. 8. The linear motion synchronizing mechanism according to claim 7, wherein the third roller is one of a pair of rollers on the third supporting member. 9. The linear motion synchronizing mechanism according to claim 8, wherein the first and second roller supporting members are side frames, wherein the third roller supporting member is a top frame and wherein the fourth roller supporting member is a bottom frame, and wherein the first, second, third and fourth roller supporting members are connected together by fasteners. 10. The linear motion synchronizing mechanism according to claim 1, wherein the first and second rollers are made of polyurethane. 11. The linear motion synchronizing mechanism according to claim 1, wherein the first and second rollers are made of metal and further comprising polyurethane surfaces configured to be disposed along the opposite sides of the linear frame member, wherein the first and second rollers are configured to roll along the polyurethane surfaces. 12. The linear motion synchronizing mechanism according to claim 11, wherein the polyurethane surfaces each have a contour that causes the compression forces to vary as the body moves in the first and second directions. 13. The linear motion synchronizing mechanism according to claim 12, wherein the contour comprises at least one valley. 14. The linear motion synchronizing mechanism according to claim 12, wherein the contour comprise at least one ramp. 15. The linear motion synchronizing mechanism according to claim 1, wherein the hub comprises a shaft that extends from opposite sides of the body, wherein a first end of the shaft is configured to pivotably connect to the first rocker arm via a first linkage and wherein a second end of the shaft is configured to pivotably connect to the second rocker arm via a second linkage. 16. The linear motion synchronizing mechanism according to claim 1, wherein the hub comprises a shaft that extends from opposite sides of the body, wherein a first end of the shaft is pivotably connected to the first rocker arm via a first linkage and wherein a second end of the shaft is pivotably connected to the second rocker arm via a second linkage. 17. The linear motion synchronizing mechanism according to claim 1, further comprising first and second axles supporting the first and second rollers, wherein the compression forces are transversely oriented to and act on the first and second axles. 18. An exercise assembly, comprising: elongated first and second rocker arms that pivot with respect to each other about a first pivot axis;a linear frame member that extends along a linear axis that is perpendicular to the first pivot axis;a body that is configured to move along the linear frame member, wherein the body comprises a first roller supporting member and an opposing second roller supporting member;a hub on the body, the hub pivotally coupling the first and second rocker arms to the body such that pivoting of the first and second rocker arms with respect to each other causes the body to move in a first direction along the linear axis and such that opposite pivoting of the first and second rocker arms with respect to each other causes the body to move in an opposite, second direction along the linear axis;a first roller retained on the first roller supporting member and a second roller retained on the opposing second roller supporting member, wherein the first and second rollers are configured to roll along opposite sides of the linear frame member as the body moves in the first and second directions; anda tensioner that applies a tensioning force between the first roller supporting member and second roller supporting member so that compression forces are applied on the first and second rollers, the compression forces causing the first and second rollers to mechanically resist pivoting of the first and second rocker arms with respect to each other about the first pivot axis. 19. The exercise assembly according to claim 18, wherein the tensioning force pulls the first and second roller supporting members towards each other so that the compression forces are generated by the first and second rollers being forced against the opposite sides of the linear frame member. 20. The exercise assembly according to claim 18, wherein the first roller is connected to the first roller supporting member by a first axle, wherein the second roller is connected to the second roller supporting member by a second axle, and wherein the compression forces are transversely oriented to and act on the first and second axles when the first and second rollers are compressed onto the opposite sides of the linear frame member. 21. The exercise assembly according to claim 20, wherein the tensioner comprises a bolt having threads, the bolt extending through one of the first and second roller supporting members and connecting to the other of the first and second roller supporting members, wherein tightening the bolt increases the tensioning force by pulling the first and second roller supporting members towards each other and wherein loosening the bolt decreases the tensioning force. 22. The exercise assembly according to claim 21, wherein the bolt is one of a plurality of bolts located on opposite corner portions of the first and second roller supporting members, each bolt in the plurality of bolts having threads and extending through the one of the first and second roller supporting members and connecting the other of the first and second roller supporting members, wherein tightening of each bolt increases the tensioning force by pulling the first and second roller supporting members towards each other and wherein loosening the bolt decreases the tensioning force. 23. The exercise assembly according to claim 22, comprising a third roller supporting member, a third roller retained on the third roller supporting member, an opposing fourth roller supporting member, and a fourth roller retained on the opposing fourth roller supporting member; wherein the first, second, third and fourth roller supporting members are each configured to be located on a different side of the linear frame member, respectively, such that the first roller supporting member is located opposite the second roller supporting member with respect to the linear frame member and such that the third roller supporting member is located opposite the fourth roller supporting member with respect to the linear frame member. 24. The exercise assembly according to claim 23, wherein the first roller is one of a pair of rollers on the first roller supporting member and wherein the second roller is one of a pair of rollers on the opposing second roller supporting member. 25. The exercise assembly according to claim 24, wherein the third roller is one of a pair of rollers on the third supporting member. 26. The exercise assembly according to claim 25, wherein the first and second roller supporting members are side frames, wherein the third roller supporting member is a top frame and wherein the fourth roller supporting member is a bottom frame, and wherein the first, second, third and fourth roller supporting members are connected together by fasteners. 27. The exercise assembly according to claim 18, wherein the first and second rollers are made of polyurethane. 28. The exercise assembly according to claim 18, wherein the first and second rollers are made of metal and further comprising polyurethane surfaces disposed along the opposite sides of the linear frame member, wherein the first and second rollers are configured to roll along the polyurethane surfaces. 29. The exercise assembly according to claim 28, wherein the linear frame member is made of metal. 30. The exercise assembly according to claim 28, wherein the polyurethane surfaces each have a contour that causes the compression forces to vary as the body moves in the first and second directions. 31. The exercise assembly according to claim 30, wherein the contour comprises at least one of a valley and a ramp. 32. The exercise assembly according to claim 18, further comprising first and second axles supporting the first and second rollers, wherein the compression forces are transversely oriented to and act on the first and second axles.