US Patent 10561886 Sand training bag

Described is a sand training bag for sand training. It includes a set of bag walls which includes a training surface wall and a perimeter wall. The sand training bag is transitionable between a closed bag configuration in which the set of bag walls defines a bag chamber to an open pit configuration in which the set of bag walls forms a sand training pit with the training surface wall forming a floor of the sand training pit and the perimeter wall forming a perimeter side wall of the sand training pit, the sand training pit being provided to receive and hold a quantity of sand.