The OBP is a full-body isometric exercise. To avoid impalement, the submissive must hold a semi-squat, rising and falling on the shaft. Within five minutes, the quadriceps and calves burn with lactic acid. This muscular fire is real. Add a space heater pointed at the back or a hot wax pour over the chest, and the "hot" becomes literal. However, beware: metal conducts temperature. A steel base left in a cold basement can shock the skin. Many advanced players use heating pads wrapped around the base (never directly on the electronics) to raise the ambient surface temperature.
The phrase is often broken down into these informal contexts: one bar prison hot