Your fascia is the netting that gives your body its shape. It was your fascias folding and unfolding before birth that formed your bones and organs.When it becomes stuck you can develop a loss in your range of motion and possibly trigger points.
In a straight myofascial release session expect some sharp sensations as the fascia releases.
Depending on what your body needs you can choose a whole hour of myofascial release or half an hour to increase your range of motion in a specific area.