Twister

An improved twister, comprising:

• a base frame having a pivot seat at the middle of an intermediate horizontal bar and two parallel, side-by-side upright bars mounted on a raised frame at a front end thereof;
• a rocker pivotally disposed between said upright bars to swing therebetween, said rocker having a grip link fitted at a top end thereof and two substantially C-shaped frames at a bottom side thereof, said C-shaped frames being spaced apart from each other near an upper end and a lower end of the bottom side of said rocker;
• a hydraulic cylinder pivotally disposed at a front side of said intermediate horizontal bar of said base frame;
• said hydraulic cylinder having a shaft that has a pivot head pivotally connected to the C-shaped frame near the upper end of the bottom side of said rocker;
• a link having an extended arm with a front end and a rear end both of which are pivotally provided with a movable connector, the movable connector at said rear end being pivotally provided with a retainer plate and the movable connector at said front end being pivotally connected to the C-shaped frame near the lower end of the bottom side of said rocker, said retainer plate having an elongated slot at a central portion thereof;
• and
• a rotatable disk having a pivot shaft at the center of a bottom side thereof, said pivot shaft being pivotally received in said pivot seat of said base frame and capable of free rotation therein, said pivot shaft having a screw pin projecting from a bottom end thereof for insertion into said elongated slot of said retainer plate to be locked with a nut so that said pivot shaft and said retainer plate may be coupled and linked together for driving said rotatable disk to rotate when said rocker swings;
• wherein said rotatable disk is rotated by said link when a user, standing on said rotatable disk, holds said grip link and pulls said rocker with both hands to cause said rocker to swing and in turn said link to drive said rotatable disk.