A golf club for showing swing condition has a shaft and a head connecting to
the
shaft, and the head having a striking face. The golf club has a visible illuminant
that is mounted on the head and exposed outside the head with an upward angle.
A battery is for providing electrical power to the light. A centrifugal switch
that is actuated by centrifugal force is mounted on the head opposite the striking
face for controlling a circuit between the battery and the illuminant. Thereby
the illuminant will light by a predetermined-strength centrifugal force during
swinging the golf club for investigating the body harmony and strength-exerting
condition of golfer.
