a rhythm indicating exercising device in the form of a generally tubular member having a preferably metallic mass or slug disposed freely slidable in the interior of the tubular member , each end of the tubular member being provided with an elastic , resilient end closure preventing the mass or slug from escaping from the tubular member . in use , one tubular member is grasped in one hand or , preferably , a pair of tubular members are held one in each hand of a person while walking and more particularly while engaged in aggressive exercise walking , that is while walking at a fast pace with extensive swinging of the arms back and forth . at the end of each forward and backward stroke of the arm , the mass or slug is forcibly propelled by inertia within the tubular member and caused to strike the corresponding end closure , thus producing a muted impact knocking sound helping the walker to maintain an effective rhythm and providing beneficial advantages in indicating proper exercising of the arms in addition to the legs .