Lactic Acid: When you workout, your body will releaselactic acid, a naturally occurring substance that your body creates when it has a low oxygen level and breaks down carbohydrates for energy. A knot is built up lactic acid, and a massage will squeeze that build up out of those muscle fibers.
Why are my muscles always so tight?
The most common reasons why muscles get tight are: overuse, dehydration, injury, and stress. Let’s look at each one and see how it contributes to muscle tightness. Overuse typically occurs with faulty movement patterns.