Hard training in a short time and much effort is the key to Fit Cross that is becoming more popular. Suitable for both men and women at any age, it tests its maximum capacity with all kinds of exercises that require much physical work for people. Like any activity is good for health but if not practiced safely can be harmful. In this note we reveal the care that must be taken when entering this practice to avoid injury and annoying pains. Intensive training called Crossfit is the latest trend in gyms, in fact has its own network of sites to practice that do not require complex and sophisticated machinery.…