An adjustable, weight resistance exercise device and method for testing and/or strengthening muscles of the pelvic diaphragm comprising an elongated, semi-rigid tube and a resilient balloon member. The tube has a first end that is formed to accommodate a hose barb and a second end. The balloon member covers the second end approximately two inches to a sealed end. A syringe is connected to the hose barb allowing fluid or gas such as water or air to flow through a passageway of the tube into the balloon member. The balloon member expands under the pressure forming a reservoir of varying diameter, length, and weight.