 So bending a horse is anytime their jowl or their jaw goes past the width of their neck. So if my horse, if his neck, say, is nine inches wide, if his jaw goes past that neck, it's a bend. That's a bend. A bend is more. Flexion, flexing a horse, is less. Flexing a horse is when they roll their jaw, and flexion comes from the first cervical vertebrae.