Almost everybody, and especially young people, plays some kind of sport. It is very good for our bodies and helps us to keep them fit. There is rather a big difference between playing sport as an amateur or as professional. Professionals should follow a special diet as they often strain some groups of muscles. In such cases they must follow the instructions of coaches and diet specialists. There are sports that are dangerous to health such as boxing, kickboxing and others. The safest physical sport is swimming. It is a really good exercise for the whole body and it can help you to relax. It is popular among both men and women. Some sports such as aerobics are more popular among girls and women and some, such as wrestling, judo or karate are snore popular among men. Any sport done in a moderate, reasonable way has a positive effect on our health.