How to judge a foul when swimming?

In swimming competition, it is not a foul for hands, feet and body to touch the lane line; However, if an athlete swims out of the lane or affects others' competition, it is a foul and will be disqualified by the referee. Among the four strokes, breaststroke, freestyle and butterfly are easy for swimmers to see the lane clearly and are not easy to foul. Only backstroke is used, because the left and right hands have different stroke strength, and swimmers are easy to swim sideways. Only according to the usual training can they judge that once their bodies touch the driveway, they can adjust their direction.

In the previous swimming competition, the three-gun system was adopted, that is, the first two people grabbed the jump, and neither of them was convicted of a foul. No sooner had they got up and started over than the third man fouled the jump.

Later, it became a two-gun system, that is, only one person can jump, which is not a foul, and the second person jumps is a foul.

At present, all competitions are one-off. As long as you jump, it is a foul. You are not qualified to participate in this competition, but you can continue to participate in other competitions.