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An exercise machine for supporting a user during exercise includes a base and a platform assembly coupled to the base. The base is adapted to be supported on a floor and the platform assembly is mounted to the base so that the platform is supported above the floor. The platform assembly is configure

An exercise machine for supporting a user during exercise includes a base and a platform assembly coupled to the base. The base is adapted to be supported on a floor and the platform assembly is mounted to the base so that the platform is supported above the floor. The platform assembly is configured to support a user performing an exercise.

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1. An exercise machine comprising a base adapted to be supported on a floor,a platform assembly coupled the base for movement relative to the base about a platform-assembly axis, the platform assembly including a beam having a head end spaced apart from the platform-assembly axis in a first directio

1. An exercise machine comprising a base adapted to be supported on a floor,a platform assembly coupled the base for movement relative to the base about a platform-assembly axis, the platform assembly including a beam having a head end spaced apart from the platform-assembly axis in a first direction and a foot end spaced apart from the platform-assembly axis in a second direction opposite the first direction, a foot-end support coupled to the beam at the foot end of the beam, and a central support coupled to the beam to slide along the beam between the head end and the foot end of the beam, anda platform-assembly lock coupled to the base and movable relative to the base from a locked position arranged to block movement of the platform assembly about the platform-assembly axis to an unlocked position arranged to allow movement of the platform assembly about the platform-assembly axis,wherein the central support includes a carriage coupled to the beam to slide along the beam, a curved dome coupled to the carriage for movement therewith, and a central-support lock that is movable from a locked position arranged to block movement of the carriage and the curved dome along the beam to an unlocked position arranged to allow movement of the carriage and curved dome along the beam. 2. The exercise machine of claim 1, wherein the carriage includes a first bracket coupled to the beam and spaced apart from the platform-assembly axis in the first direction, a second bracket coupled to the beam and spaced apart from the platform-assembly axis in the second direction, and a plate coupled to the first bracket and the second bracket. 3. The exercise machine of claim 2, wherein the plate is round and the curved dome is a partial sphere arranged to extend upwardly from the plate. 4. The exercise machine of claim 1, wherein the foot-end support includes a foot platform and a leg restraint. 5. The exercise machine of claim 4, therein the leg restraint includes a pylon, a pair of upper rollers coupled to the pylon, and a pair of lower rollers coupled to the pylon to provide a left lower-leg receiving space and a right lower-leg receiving space. 6. An exercise machine comprising a base adapted to be supported on a floor,a platform assembly coupled the base for movement relative to the base about a platform-assembly axis, the platform assembly including a beam having a head end spaced apart from the platform-assembly axis in a first direction and a foot end spaced apart from the platform-assembly axis in a second direction opposite the first direction, a foot-end support coupled to the beam at the foot end of the beam, and a central support coupled to the beam to slide along the beam between the head end and the foot end of the beam, anda platform-assembly lock coupled to the base and movable relative to the base from a locked position arranged to block movement of the platform assembly about the platform-assembly axis to an unlocked position arranged to allow movement of the platform assembly about the platform-assembly axis,wherein the foot-end support includes a foot platform and a leg restraint, andwherein the foot platform includes a foot plate coupled to the beam to slide relative to the beam and a foot-plate lock movable from a locked position arranged to block movement of the foot plate relative to the beam to an unlocked position arranged to allow movement of the foot plate relative to the beam. 7. The exercise machine of claim 1, wherein the platform assembly includes a head-end support coupled to the beam at the head end of the beam. 8. The exercise machine of claim 7, wherein the head-end support includes a cushion coupled to the beam and a hand grip coupled to the beam. 9. The exercise machine of claim 1, wherein the platform assembly is coupled to the base to pivot from an inclined position in which the foot end of the beam is arranged below the head end of the beam to a declined position in which the head end of the beam is arranged below the foot end of the beam. 10. An exercise machine comprising a base adapted to be supported on a floor,a platform assembly coupled to the base to pivot about a first pivot axis, the platform assembly including a beam and a curved dome coupled to the beam to slide along the beam between a head end and a foot end of the beam, anda blocker mechanism coupled to the base and configured to hold the platform assembly in a selected position relative to the base. 11. The exercise machine of claim 10, wherein the platform assembly includes a hitch arranged along the first pivot axis and blocker mechanism includes a platform-assembly lock movable from a locked position engaged with the hitch to block movement of the platform assembly about the first pivot axis to an unlocked position disengaged from the hitch to allow movement of the platform assembly about the first pivot axis. 12. The exercise machine of claim 10, wherein the blocker mechanism includes a first strut coupled to the base to pivot about a second pivot axis, a second strut coupled to the beam to pivot about a third pivot axis and coupled to the first strut to slide along the first strut, and a platform-assembly lock moveable from a locked position arranged to block movement of the second strut relative to the first strut to an unlocked position arranged to allow movement of the second strut relative to the first strut. 13. The exercise machine of claim 12, wherein the second strut is coupled to the first strut to telescope relative to the first strut. 14. The exercise machine of claim 10, wherein the platform assembly includes a central-support lock movable from a locked position arranged to block movement of the curved dome along the beam to an unlocked position arranged to allow movement of the curved dome along the beam. 15. The exercise machine of claim 14, wherein the platform assembly includes a plate that underlies the curved dome and a first bracket coupled to the plate, the first bracket arranged to receive a portion of the beam. 16. The exercise machine of claim 10, wherein the platform assembly includes a foot plate coupled to the foot end of the beam to slide relative to the beam and a foot-plate lock movable from a locked position arranged to block movement of the foot plate relative to the beam to an unlocked position arranged to allow movement of the foot plate relative to the beam. 17. An exercise machine comprising a base adapted to be supported on a floor,a beam coupled to the base, anda central support coupled to the beam to slide along the beam between a head end and a foot end of the beam, the central support including a carriage coupled to the beam to slide along the beam, a curved dome coupled to the carriage for movement therewith, and a central-support lock that is movable from a locked position arranged to block movement of the carriage and the curved dome along the beam to an unlocked position arranged to allow movement of the carriage and curved dome along the beam. 18. The exercise machine of claim 17, further comprising a foot-end support coupled to the beam at the foot end of the beam wherein the foot-end support includes a foot platform and a leg restraint and the leg restraint includes a pylon, a pair of upper rollers coupled to the pylon, and a pair of lower rollers coupled to the pylon to provide a left lower-leg receiving space and a right lower-leg receiving space. 19. The exercise machine of claim 18, further comprising a cushion coupled to the beam at the head end of the beam sized to support a user's head.