an exercise device comprising interconnected , water - tight compartments which define a vest for supporting a fluid weight medium from the shoulders and about the upper torso of a human exerciser . water or other fluid is removeably introduced into the water - tight compartments in variable amounts to weight the vest for use by the exerciser . air is introduced into the compartments to occupy space not occupied by the water in order to fill out the vest . the air and water is expelled from the compartments to facilitate easy and light - weight transportation of the vest .