Answer: Failure to warm up.
Step-by-step explanation:
Work out injury is any injury that happens during the workout. From the given options failure to warm up is a major cause of injury. Correct answer: D The warm-up prepares the body for the exercise because it gradually increases the heart rate and loosens the muscles and joints .
All other options if are made careful and the right way will not result in injury. Improper execution of exercises is the major cause of injury.