Neutral posture refers to the correct alignment of our spine from head to tailbone, and the continuation of that alignment through the hips, knees, ankles and feet. In a nutshell, our ears shoulders, hips, knees and ankles should all be in a vertical line. Our spines should have a balanced S-curve that positions those elements naturally.
Unfortunately, due to many factors such as lengthy time at the computer, in front of the TV, or at the desk, gravity takes over and our postural muscles lose their influence. Other factors may include prior injury, chronic pain, poor eyesight, and uneven weight distribution.
The good news is that posture can also be relearned. Perfect alignment is a very efficient way of keeping the body upright, so it is more comfortable in the long run. Good posture also eliminates neck pain due to strain, and allows muscles to work in proper sequence, avoiding overload of some at the expense of others.
You can count on postural retraining in your program, if it is needed.