Abstract: A shooting exercise allows multiple shooters to shoot laser beams simultaneously at a target with several receivers with a laser gun. First, each laser gun held by each shooter is tuned to a unique frequency. Second, the shooters simultaneously shoot laser beams at the target. Third, receivers on the target register target hits. Fourth, a hit signal is sent to a host by the receiver when a receiver is struck by a laser beam. Fifth, the host processes the hit signals and produces a result. Then, the results are displayed on a monitor to show the hits of each shooter. Finally, a speaker sends out a sound.

Abstract: The present invention has a microprocessor, a head sensor, a graphic display and a keypad. When a distance between the heat sensor and heat source changes, a frequency of a wave pattern shown on the graphic display has high and low states. The user just sees the graphic display to clearly know whether the heat source close to the body from the frequency of wave pattern changing. Besides the heat detector further has at least one laser diode to point a position corresponding to the location of the heat source and an alarm unit to warn the user that the heat source is closing.

Abstract: A variably-weighted exercise hoop includes a plurality of large hollow balls, a plurality of plugs corresponding to and received in the balls, and a cable extending through and securing together the combined balls and plugs. A fixed quantity of pellets is enclosed in each combined ball and plug, and that quantity is varied by the manufacturer to achieve hoops of different weights using only one mold, whereby users of different abilities can have suitable hoops. The pellets provide both audible and physical rhythms for a user as the hoop rotates.