A stimulant target unit, comprising: a housing, wherein the housing includes a first shell that is a primary contact member connected to a second shell via an elastomeric rim, wherein the rim has opposing first and second grooves (176, 178) and the first shell has a first axially extending flange along a periphery thereof, wherein the second shell has a second axially extending flange along a periphery thereof, the first flange is disposed in said first groove and the second flange is disposed in the second groove, and the first flange ordinarily not bottoming in the first groove and the second flange ordinarily not bottoming in said second groove to thereby enable the first shell to move axially relative to the second shell upon impact; at least one stimulation source coupled to the housing, the stimulation source configured to provide a stimulus to stimulate a user; a contact sensor coupled to the housing and configured to detect an impact to the primary contact member; a feedback system configured to inform the user that the stimulant target unit has been actuated in response to the stimulus; a controller programmed to register triggering of the contact sensor; a mounting structure configured to connect the stimulant target unit to a support structure, wherein the mounting structure includes a vibration isolator configured such that wherein, over a selected first range of impact forces, the contact sensor is configured to be triggered by an impact that is within the first selected range of impact forces, and wherein the vibration isolator inhibits transmission of force from an impact within the selected range of impact forces on the support structure to the contact sensor sufficiently to prevent the triggering of the contact sensor; and a protective cover, configured to cover the primary contact member, and configured to be positioned spaced from and in front of the primary contact member to transmit the impact to the primary contact member to trigger the contact sensor over a second range of impact forces that is higher than the first range of impact forces. a housing, wherein the housing includes a first shell that is a primary contact member connected to a second shell via an elastomeric rim, wherein the rim has opposing first and second grooves (176, 178) and the first shell has a first axially extending flange along a periphery thereof, wherein the second shell has a second axially extending flange along a periphery thereof, the first flange is disposed in said first groove and the second flange is disposed in the second groove, and the first flange ordinarily not bottoming in the first groove and the second flange ordinarily not bottoming in said second groove to thereby enable the first shell to move axially relative to the second shell upon impact; at least one stimulation source coupled to the housing, the stimulation source configured to provide a stimulus to stimulate a user; a contact sensor coupled to the housing and configured to detect an impact to the primary contact member; a feedback system configured to inform the user that the stimulant target unit has been actuated in response to the stimulus; a controller programmed to register triggering of the contact sensor; a mounting structure configured to connect the stimulant target unit to a support structure, wherein the mounting structure includes a vibration isolator configured such that wherein, over a selected first range of impact forces, the contact sensor is configured to be triggered by an impact that is within the first selected range of impact forces, and wherein the vibration isolator inhibits transmission of force from an impact within the selected range of impact forces on the support structure to the contact sensor sufficiently to prevent the triggering of the contact sensor; and a protective cover, configured to cover the primary contact member, and configured to be positioned spaced from and in front of the primary contact member to transmit the impact to the primary contact member to trigger the contact sensor over a second range of impact forces that is higher than the first range of impact forces.