Abstract: This disclosure extends to systems, apparatus, and methods for exercising using dynamic fluid movement. In one embodiment, an assembly may have a central body formed as a closeable reservoir, with two opposite side handles. The handles may each include a rotatable grip member. The reservoir may be at least partially filled with a liquid. As user exercises, the assembly is moved while user maintains a grip on at least one grip member. The rotatable grips allow for movement of the central body while the grip is maintained. As the assembly is moved for an exercise, movement of the liquid in the reservoir provides an additional force. In one exemplary exercise, a user may hold the assembly by the opposite grips and walk or run while swinging the arms and rotating the torso back and forth. Where a cap is present, the central body may serve as a water bottle.