Nobody needs reminding that exercise is good for our physical health, but we may need reminding that it needs to be done in the right way.

Light exercise is a great way to improve circulation (循环) and keep our muscles active, especially if the rest of the day will be spent sitting in front of a computer or in a lecture hall. However, certain sports like long distance running require training to build up our bodies so we can handle the challenge. If we go into such sport cold, it can shock our muscles, hearts, lungs, and other organs and cause severe pain or in some cases, even death.

Some people are born with medical conditions that go unnoticed until they stress the unstable part of their body. A weak heart may never be seen until we do something that causes extreme physical effort. Recently there have been cases of people dying while running long distances. Also, a university student died after taking a 1, 000 m running exam. Some universities and high schools have cut long distance races (i. e. 3, 000 m, 5, 000 m) from their campus sports games, partly because of the potential danger and partly because they say fewer people are entering such events.

Maybe education about such events is lacking, especially during primary and high school. People participating in such competitions should realise that a reasonable amount of training is required beforehand and having a medical check is wise, especially for a marathon. People shouldn't be forced to participate in events that push them past their limits, especially if they haven't warmed up completely. Cancelling events could lead to people becoming less healthy and overweight. Maybe these events shouldn't be cancelled, but organisers and participants should be more careful about regular health examination.