Most of the painful conditions why people go to a physiotherapist/kinesitherapist are actually chronic injuries, damage or overuse syndromes, not acute injuries. Acute injury is the result of physical trauma (clearly defined cause), such as impact, fall, sprain, strain, rupture, contusion, fracture. It occurs suddenly and instantaneously (short action of mechanical force). It is the result of the action of excessive force on our locomotor system (bones, muscles, ligaments, fascia, joint capsules) and partial or complete rupture of the structure occurs. It manifests itself in the form of sharp pain. Chronic injury (overstrain syndrome) occurs gradually, over a long period of time, is not directly caused by physical trauma, but is a consequence of excessive training, inadequate load and microtrauma that overcome the tissue's ability to repair (recover), and does not necessarily cause a structural change; in other words, ultrasound or magnetic resonance imaging findings may be normal. A person registers them as an injury only when the pain becomes stronger or makes it impossible for them to continue their activities, and the cause actually arose much earlier. The most common scenario is that mild, uninterrupted pain occurs after activity and passes quickly. Pain may also appear at the beginning of the activity, then disappear after warming up. It gradually lingers longer and longer during and after the activity, and eventually it will be permanent, unrelated to the activity. Many only then ask for help. Overexertion syndrome results in inflammation of the tendons (grips), swelling and stress fractures. Soft and supporting tissues, and less often bones, are the subject of these injuries. Although acute injuries and overexertion syndromes are present in both professional and recreational sports, it can be said that overexertion syndromes pose a greater risk to professionals, and acute injuries to recreational athletes because they often start sports activities after a long break, physically unprepared.