| abstract |
Embodiments of the present disclosure are directed to leak-free exercise devices that are soft and conformable due to being filled with granular material. The devices are formed from one or more flexible panels joined together to form a cavity and a filler material, such as sand, contained within the cavity. The devices comprise welded seams that prevent liquid or moisture from entering the cavity and/or granular material from exiting the cavity. In some embodiments, the one or more flexible panels may further be made of waterproof materials. |