Abstract: An exercise device has an outer tank containing a supply of liquid and an inner container with mechanism for receiving a portion of the liquid from the tank when the container is in a first position and mechanism for discharging the liquid from the container at a controlled rate when in a second position. The inner container is connected to an elongated member that extends out of the tank and may be pulled upon by the user. A conduit may supply liquid under pressure selectively to the liquid container, in response to user demand as indicated by activation of a switch, and the liquid may then drain from the container through the same or a different conduit, to the original reservoir or a drain; and in this embodiment the container need not enter the tank or reservoir.