Apparatus for training horses includes a housing including a lower section under an upper section, the lower section configured with a stall for confining a horse and having opposed sides, and the upper section including a tank for loose granular material and configured with a hopper proximate to each of the sides, the hoppers concurrently openable for releasing the loose granular material into the lower section from above the stall along the respective sides for sufficiently filling the stall with the loose granular material for covering at least a portion of the horse.