Final answer:
The common kick-boxing mistake addressed by the American Council on Exercise is overextending or locking the joints during kicks and punches, which can lead to injuries. Maintaining a slight bend in the joints and practicing good form are essential for prevention.
Step-by-step explanation:
One of the most common, potentially injurious kick-boxing mistakes according to the American Council on Exercise (ACE) is the improper execution of kicks and punches. This typically involves overextending or locking the joints, particularly the elbow or knee, when performing these actions. Overextending joints can lead to strains or more serious injuries, as it places undue stress on the ligaments and tendons. To prevent this, it is essential for kick-boxers to maintain a slight bend in their joints when kicking or punching. Additionally, practicing proper form and technique, and ensuring adequate warm-up and cool-down periods are also crucial to minimize the risk of injury.