Certified Personal Trainer (NSCA) Practice Exam

For a client who is 6'9" and weighs 230 lb, what guideline applies when introducing stability ball exercises?

1. Slightly under-inflate the ball

2. Thighs should be parallel to the ground when sitting on the ball

3. Slight deviations from correct technique are acceptable

4. Stop resistance training and perform only stability ball exercises

The correct answer is: Thighs should be parallel to the ground when sitting on the ball

Introducing stability ball exercises involves ensuring the client maintains proper posture and body alignment. The guideline stating that thighs should be parallel to the ground when sitting on the ball is crucial because it indicates that the client needs to achieve a proper hip and knee angle. This position helps optimize stability and balance, allowing for effective engagement of core muscles and reducing the risk of injury during the exercise. Proper positioning on the stability ball aids in enhancing proprioception and facilitates effective movement patterns. For someone tall, like a client who is 6'9", achieving this parallel thigh position can be particularly challenging and therefore essential in tailoring their stability ball routine to ensure that exercises are both safe and effective. Proper alignment supports effective force generation and movement mechanics, which are vital elements for anyone engaging in strength training or balance work.