Ski exercising apparatus

A ski exercising apparatus, comprising:

• a set of two parallel, arcuate rails joined to first and second end tubes at a base level, forming a part of a rigid frame structure having a width, a length, a height above the base level and a lengthwise centerline, the rails providing a track rising from each end tube to a maximum height at a center of the length;
• a center frame element having a bottom plane across the width at the base level and sides joined to and supporting each of the arcuate rails;
• a first flat belt guide joined to the first end tube and to the bottom plane of the center frame element, a second flat belt guide joined to the bottom plane of the center frame element and to the second end tube, the first and second flat belt guides forming a first lengthwise guide track from end to end of the apparatus on one side of the lengthwise centerline;
• a third flat belt guide joined to the first end tube and to the bottom plane of the center frame element, a fourth flat belt guide joined to the bottom plane of the center frame element and to the second end tube, the third and fourth flat belt guides forming a second lengthwise guide track from end to end of the apparatus on a second side of the lengthwise centerline;
• a wheeled carriage riding on the track, such that the carriage, in side-to-side movement along the track rises to a maximum height at a center of the track, and descends from the center;
• a set of two articulated footpads mounted side-by-side on the wheeled carriage;
• a first and a second powerband, being a first powerband set, constrained in the first lengthwise guide track, the first powerband clamped under the wheeled carriage on a first side, and the second powerband clamped under the wheeled carriage on a second, opposite side, the first and second powerbands exerting force urging the wheeled carriage toward the center of the track as the wheeled carriage is moved from the center of the track;
• and
• a third and a fourth powerband, being a second powerband set, constrained in the second lengthwise guide track, positioned parallel to the centerline of the frame structure and offset from the centerline by a distance at least one-quarter of the width of the frame structure to a second side of the centerline, the third powerband clamped under the wheeled carriage on the first side, and the fourth powerband clamped under the wheeled carriage on the second, opposite side, the third and fourth powerbands exerting force urging the wheeled carriage toward the center of the track as the wheeled carriage is moved from the center of the track;
• characterized in that the first and the second powerband sets are parallel, spaced apart by at least one-half the width of the frame structure, and are equidistant from the centerline.