Which of the following is a common error during the back squat?

A common error during the back squat is positioning the bar too high on the cervical spine. When the barbell is placed too high, it can cause excessive pressure on the neck and spine, leading to instability throughout the lift. This improper positioning can hinder the lifter's ability to maintain proper form and balance, making it more difficult to execute the squat effectively. It can also lead to discomfort or injury if the barbell does not rest in a safe and stable position across the upper back.

Proper barbell placement is crucial for maintaining an efficient squat, as it allows for optimal force transfer from the legs through the torso. A more appropriate placement would be across the muscles of the upper trapezius or the rear deltoid area, which helps to create a stable base and better alignment of the spine throughout the lift.