Abstract: A trainer is formed of a handle joined to an end of an elongated tubular chamber containing a charge of metal beads. A longitudinal tension rod unites chamber and handle to protect the integrity of the trainer and enable it to be constructed from light weight material such as PVC plastic tubing. The charge of beads weights the trainer to match the feel of a real club. The beads shift in the chamber during a practice swing so that the player sees, feels and hears the shift of the metal beads at appropriate points during the swing, to alert the player when he has swung with proper lag. The beads self-generate a signal by their relative movement in the tube, even without reaching an end of the tube. The player can adjust his swing in increments to alter the point at which the charge of beads shifts in the chamber.