In throwing events, there are usually two referees holding a red flag and the other white flag to show whether the athletes have succeeded in trying to throw. Holding a red flag means that the trial vote failed and the result is invalid; Holding a white flag means a successful and effective result.
One of them standing near the throwing area is called infield referee, who mainly judges whether the athlete commits a foul in the trial throw; The other one in the landing area is called outfield referee, which mainly judges the effectiveness of the landing point of the equipment.
Measurement skills:
1. Straighten the tape measure and pull the zero scale line of the tape measure to the landing point, that is, the end closest to the throwing line.
2. Stretch the other end of the tape measure through the origin.
3. Straighten the tape measure, and then read the value between the origin and the endpoint, and the reading is the result.
4. In men's competition, the diameter of shot put must be between1/kloc-0-130mm, and that of women is between 95- 1 10mm.