Per PRCA rules, during rough stock events, the flank strap is to be applied just above their hind legs (not their genitals, despite what most people think). In bull riding, the flank strap is a rope, while in saddle bronc and bareback riding, the flank strap is a 4-inch wide belt, covered in sheepskin or neoprene. The flank strap is used to encourage the animal to use its hind legs more in a bucking motion. This motion is safer for both the rider and animal – it’s better for the bucking bull or bronc to use its hind legs rather rearing up and potentially hurting the rider and itself.