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Chronic injuries primarily occur as a result of repetitive stress over time. This is characterized by the accumulation of microtraumas to tissues, which can happen when the body is subjected to prolonged or frequent activities without adequate recovery. For example, repetitive motions common in certain sports or professions can lead to conditions such as tendinitis or stress fractures.

This type of injury contrasts with acute injuries, which tend to arise from immediate and intense force applied to the body, such as a sprain from a sudden twist or a fracture from a fall. While uncontrolled accidents and external impacts can lead to injuries, they usually do not result in chronic conditions, as chronic injuries are specifically linked to the gradual wear and tear on the body from repeated actions or stresses over a longer duration.

Therefore, the identification of repetitive stress over time as the cause of chronic injuries highlights the importance of understanding the factors that contribute to such conditions, enabling personal trainers to develop effective training and injury prevention strategies for their clients.