Leading British dressage rider Laura Bechtolsheimer discusses bitting with Sprenger MD Heinz Baumann. Laura admits she knows less about the conformation of the horse's mouth than she should and asks Heinz to separate the fact from the fiction. Heinz says his views have changed as a result of recent research into space in the horse's mouth and the functioning of the tongue. Using Laura's youngster Step, Heinz calculates the size and shape of the bit that will most suit him. Laura asks renowned trainer Klaus Balkenhol for his views. She then asks Brigitte Schulte which double bridle to introduce her youngsters to.