The inventive concept presented is a fitness training system featuring a plurality of different-sized containers having a detachable, water-tight sealing cap by which each container may be filled with a determinable quantity of a liquid, constituting a specific volume. The volume of the inserted liquid equates to a weight in pounds, facilitating the use of each container for exercise and fitness training. In the preferred embodiment, the liquid utilized is ordinary tap water. In this manner, a user may choose from a selection of variously-dimensioned containers, and proceed to fill an appropriate volume of water for creating the desired weight of one or more containers. By use of a handle grip and a handle stabilizer attached to the exterior surface of each container, the user exercises and strengthens a particular muscle or grouping of muscles, including the associated stabilizer muscles.