The one-hand rein is suitable for checking whether your horse is walking on its own legs. It also allows you, as a rider, to check whether you're sitting independently, but you can also practice this with the one-hand rein.
The one-hand rein is also suitable for relaxed riding in the woods or for a change of pace. The one-hand rein is adjustable in length so it's the right length for you as a rider.
