Tory Leather - Harness Leather Lateral Action Training Fork with Neck Strap - From the original Tory Leather - MADE IN USA. This lateral action training fork has a neck strap and tie down. The lateral fork differs from a standard training fork or running martingale because it allows the horse to turn its head from side-to-side thus enabling the rider to work on suppleness and bending while teaching the horse to carry his head in the right position.