US Patent 8652014 Heavy training bag

The present invention is a heavy training bag for pugilistic, martial and other similar arts, which provides uniform resistance and contains non-settling filler material. The bag comprises an optional support core contained within a cushion core, which in turn is contained within an impact core, which in turn is contained within an optional outer cover; further wherein the impact core is comprised of at least a rib, but preferably, a plurality of ribs.