system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5 how a "knot" in a muscle is formed, and how massaging the area gets rid of it.
gpt
Think of your muscle fibers as a bundle of spaghetti noodles, stretching and shrinking with each action that you perform.  Sometimes these 'noodles' (fibers) dont quite shrink back the way they should and get bunched up in a particular spot causing a knot. Massage helps to release this bundle by relaxing it so that your muscle fibers can return to a normal position within the bundle.