Once physical activity takes on a competitive nature, it automatically increases the likelihood of injury, that's just the way it is. My nieces are playing hockey, and its all fun and games now (ages 6 and 8), but I know that once they hit their teens, they will start a long life of sprains, strains, tears, bumps, bruises and breaks. If one is interested in crossfit for fitness they should avoid the competition side of it, for sure.
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