sentences:  This springing action could not be generated effectively, for this punch, if an upright stance was used or if the bodyweight was positioned predominately over the back leg.The preparatory positioning of the bodyweight over the bent lead leg is also known as an isometric preload.Left-handed or southpaw fighters use a mirror image of the orthodox stance, which can create problems for orthodox fighters unaccustomed to receiving jabs, hooks, or crosses from the opposite side.