The rider's position, balance, and movement quality directly affects horse welfare through back loading, bit pressure, and the clarity of communication between horse and rider.
The rider is part of the horse's welfare equation - not just the person providing care and training. A stiff, unbalanced rider creates pain and restriction in the horse's movement regardless of the quality of all other welfare provisions. Equestrian education that includes rider biomechanics as a welfare topic rather than solely a performance topic shifts the framing from 'how do I ride better' to 'how does my riding affect my horse's experience' - a genuinely welfare-centered perspective.