Bat for golf swing practice

A bat for golf swing practice, the bat comprising:

• a head including:
• a tube body provided inside the head and having a hollow inside, a first side, and a second side opposite to the first side;
• a movable body configured to move within the tube body and made of a paramagnetic substance;
• a magnetic body disposed on the first side of the tube body;
• and
• a screw made of a paramagnetic substance, penetrating through an inside of the magnetic body, and configured to hold the movable body at the first side of the tube body by a magnetic force transferred from the magnetic body;
• a first shaft connected to one end of the head;
• a length adjustment part connected with the first shaft;
• a second shaft connected with the length adjustment part and having a grip formed at one end thereof to allow a gripping by a hand of a user;
• and
• a swing measurement module mounted on at least one of the head, the first shaft, the length adjustment part, and the second shaft,
• wherein the swing measurement module comprises:
• a first sensor, including a gyro sensor or an acceleration sensor, configured to measure a swing speed of the user from a backswing apex point to a follow swing point;
• and
• a second sensor, including a gyro sensor or an acceleration sensor, configured to recognize a swing trajectory, beginning at a downswing, passing through an impact point, and arriving at a follow-through, during a practice swing by the user,
• wherein the swing measurement module is configured to compare and check whether or not a point at which the movable body being detached from the screw reaches the second side of the tube body during the practice swing by the user matches the impact point of the swing trajectory recognized by the second sensor, and is configured to display the compared and checked result through a display screen mounted on the bat.