Molecules of Hope: How Muscle Contractions Physically Heal Brain Trauma

We have always been told that exercise is good for mental health because it releases endorphins—a temporary rush of feel-good chemicals. While true, this grossly underestimates the profound biochemical magic occurring inside a moving body. Recent breakthroughs in physiology have revealed that muscles are not just mechanical pulleys for our bones; they are a massive, active endocrine organ.

When muscles contract during exercise, they manufacture and release specialized proteins directly into ...