“At speed higher than the walk, the amplitude of the axial movements is reduced and difficult to discern with the naked eye. Presumably, the muscular resistance increases, making the vertebral column as nearly rigid as possible in order to resist wasteful sidewise, lateral motion.” (James R. Rooney, Biomechanics of lameness in horses, 1976) Almost fifty years ago, James Rooney aimed the equestrian world in the right direction explaining that .
Stability is a fundamental element for correctness of the gaits, precision of the performances, and soundness.