Abstract: A system and method for determining an amount and direction of a golfer's head movement as the golfer executes a golf swing. The system may include at least two light baffles for monitoring the golfer's head movement along a path generally parallel to a target line. The baffles may reflect light into the golfer's eyes when the golfer's head is either outside and to the left of a preset range, or outside and to the right of the preset range. The system may further include at least two additional light baffles for monitoring lunging and bobbing head motion. The additional light baffles may reflect light into the golfer's eyes when the golfer's head lunges or bobs beyond a further preset range.

Abstract: A motion converter device capable of converting continuous rotary input motion to cyclic linear motion and capable of accomplishing the reversal thereof from cyclic linear motion to continuous rotary motion including means for substantially smoothly obtaining the conversion. The unit includes a set of gear trains having gears of a selected shape and which gear trains are intermeshed from either a single rotary shaft or a plurality of linked output shafts which interwork to convert the rotary motion of the single shaft to oscillatory or linear motion of the output shafts or will, in the reverse of this procedure, convert a linear input to the plurality of shafts to rotary motion of the single shaft.