The training / lungeing aid system has been designed to encourage the important development of back muscles.
The system forces the back muscles to work, especially when in a low position. This helps to develop muscles at the base of the neck.
Using the system in a middle position encourages the development of the upper neck muscles.
Progressing to canter work with the system in a higher position, encourages the horse to take the weight off the forehand and bring his hindquarters underneath him, thus improving his balance.