Your primary stress hormone, involved in energy, alertness, and inflammation.
Cortisol
Why it matters
Chronically elevated cortisol affects sleep, skin, mood, and training recovery.
In practice
Walks, breathwork, and consistent sleep are practical cortisol levers.
Related terms
Stress management, Sleep hygiene
Definitions in the Knowledge A–Z are general education, not medical advice. They do not diagnose or treat any condition. Speak to a qualified professional about anything specific to you.