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With the use of empty bottles and a unified packing specification on the cap and neck of the bottles, they can be turned into dumbbells for the purpose of fitness application. This design allows travelers to exercise at any time and in any place with its overlapping punched holes to inject water into the bottle. Moreover, users can apply this equipment with either one hand or both hands due to its ergonomic design. Users will find it convenient to apply not only at home but also on a trip.
Tainan city, Taiwan