I like going bareback and bridleless because it really helps me focus on my seat and leg cues and really shows if there are any holes in the training.
You have to do it with a horse you trust and I would highly suggest doing it in an enclosed/fenced in area. There are a lot of videos out there that explain how to train bareback and bridleless for those interested. The biggest thing is to make sure you have a horse that is well trained to leg-cues and stops completely by your seat alone.