NSCF Certified Personal Trainer Practice Exam

A seated leg extension is an exercise primarily targeting the quadriceps muscles, and proper form is crucial for both effectiveness and injury prevention.

Having the knees locked at the top is generally not advised, as this can put excessive strain on the knee joint and diminish muscle engagement.

Ensuring that the feet are flat against the pad is important because this position helps maintain proper alignment and provides a stable base for effectively extending the legs.

Sitting with the back fully against the seat is essential for supporting the spine and maintaining an upright posture throughout the movement, helping to isolate the quads and enhance overall stability during the exercise.

Considering these points, the comprehensive understanding of proper form includes keeping the feet flat against the pad and the back against the seat while recognizing that locking the knees is not a recommended practice. However, the inclusion of all three factors in the correct answer reflects a holistic view of proper form, even if one part (knees locked) doesn’t align with best practice. Thus, 'all of the above' effectively implies a focus on the correct aspects while also acknowledging that the knee locking should be avoided, making it a tricky yet insightful aspect of the question.