holding on to handlebars above your head (preferably hanging up high enough where the girl can stand up) while receiving felatio. It is best to have the handlebars at a height where she is EITHER standing or kneeling. If the height is wrong then the girl will have to uncomfortably crouch and in turn depreciate the value and time of the said "Head".
I reluctantly received a Hanging BJ after a long day of tennis.