1. When assessing a client's squat form, which biomechanical principle is most important for a personal trainer to observe? A) Force production B) Torque C) Leverage D) Kinetic chain alignment Correct Answer: D) Kinetic chain alignment Rationale: Proper kinetic chain alignment ensures that the movement is performed with the correct posture and joint angles, reducing the risk of injury and improving the efficiency of the exercise. 2. During a bicep curl, what type of lever is the elbow joint acting as? A) First-class lever B) Second-class lever C) Third-class lever D) Fourth-class lever Correct Answer: C) Third-class lever Rationale: In a bicep curl, the elbow acts as a third-class lever where the force is applied between the fulcrum (elbow joint) and the load (weight in hand), which is typical for most limb movements in human biomechanics. 3. Which of the following best describes the 'stretch-shortening cycle' used in plyometric training? A) An eccentric contraction followed by an immediate concentric contraction B) A concentric contraction followed by an immediate eccentric contraction C) A static hold followed by a dynamic movement D) A dynamic movement followed by a static hold Correct Answer: A) An eccentric contraction followed by an