a personal under fire trainer includes a harness holding a wireless receiver and plural electrode leads . the harness can be donned by a trainee and the leads connected to electrodes attached to the trainee &# 39 ; s body . a trainer can operate a remote transmitter to send a signal to the receiver , activating one or more electrodes which contract the trainee &# 39 ; s muscles , forcing the trainee to react under simulated gun fight conditions while receiving simulated gunshot wounds .