Final answer:
The statement is true; a personal trainer needs to be aware of how the body works to avoid causing injuries to clients due to improper workouts, by understanding the bodily mechanisms involved in exercise and ensuring adequate muscle recovery.
Step-by-step explanation:
True, a personal trainer can cause a client injury with an inappropriate workout if the trainer is not aware of how the body works. It is critical to understand that improper resistance training can lead to serious injuries, including overuse injuries of the muscle, tendon, or bone. Loading the muscles too heavily, failing to provide adequate recovery time, or poor joint alignment during exercise can cause cellular damage to the muscle fibers. This damage not only causes soreness but can result in tendon damage and even skeletal damage if the muscles are overworked. Knowledge of the body and correct application of forces and torques are essential for safe and effective physical training.