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Americans are interested in exercise. When an exercise method promises to help a person lose weight or get fit, it can become very popular, very quickly. We call these exercise trends. One current is CrossFit. CrossFit is a company and training program established in California in the 1970s. The number of CrossFit centers, or gyms, has doubled every two years. And not just in the U.S. There are CrossFit gyms in South America, Europe and Asia, too. CrossFit is a program that works the entire body. And it is not an easy one. CrossFit is known as one of the hardest training programs in the exercise world. The U.S. Marines, professional sports teams, fire departments, and police forces use CrossFit. But it is also popular with people who work in office jobs. CrossFit uses weight training and movement like running and jumping. The movements are simple but performed at a very intense level. Kate Garufi is a trainer at District CrossFit in Washington, D.C. She says the goals are to get stronger, improve the heart and blood system, and become looser. There are more than 8,500 CrossFit gyms worldwide. People train in groups in the CrossFit program. Results are measured by how long it takes to complete a set of exercises. CrossFit group members say they begin to feel like a family. They get support from each other but also added pressure. Members say they do not want to fail their group. Critics say CrossFit has a high rate of injury. Members can experience muscle damage, especially shoulder injuries. But CrossFit supporters say a good trainer can help people avoid injuries.