Abstract: An exercise baton includes a tube having within its interior several elongated s weights. The weights can be added and removed without changing the external shape of the baton. A divider inside the tube helps keep the weights properly distributed, so that the baton is kept centrally balanced regardless of the number of weights. The divider plus a resiliently compressible pad help keep the weights from rattling. The tube is made of clear plastic, so one can see how many weights are inside. In some embodiments, a photoluminescent material, or some other light source, is placed inside the baton so light can shine out through the tube.