Abstract: A more stable pogo stick device, which may or may not be steerable, employs multiple spring legs, at least one of which can have an alterable spring rate. To steer in a direction, the alterable spring rate is employed, whereupon the pogo will move in the direction of the softer spring. Further, a pogo stick with enhanced stability and safety is provided by employing multiple, vertical springing legs. A pogo with enhanced stability and widened foot platform provides the ability for a single rider to perform tricks and/or to allow multiple riders to jump together at the same time.

Abstract: The present invention is concerned with a device for aiding the teaching and training techniques for hitting a baseball accommodating different initial head position and batting style, comprising: a helmet fitted with a mercury switch connected to a motor; a nulling circuit which sets the positional angle of the mercury switch, a tone generator control which activates a tone generator and notifies the batter; two magnetic switches located on each side of the helmet; and, a magnet located on the batter's shirt and a power supply.