Hot walkers have been around for years. It is in its basic form a means for a horse to be exercised or cooled out. A person that walks a horse, like a race horse or an event er, can be considered a groom with the job of walking a horse. This however is not what most of us think of when we think of a hot walker. We think of a four to eight armed machine that people tie horses to and it walks the horse around in a circle. There are many types of mechanical hot walkers, each with their unique advantages and disadvantages.