Hormones, Mental Health, and Exercise… How do it all work?

We hear it all of the time… exercise is good for mental health. We know we “feel better” after a workout, sleep more soundly, and handle stress more gracefully, but what is actually happening here?

Let’s get down to a cellular level. Exercise is a massive coordinated process for the body, and almost every process in the body requires hormones and chemical messengers. When we strength train, especially at a high intensity, the body responds by releasing and regulating hormones that influence mood, focus, resilience, energy, and brain health.

Here are some of the key hormones and compounds impacted by exercise:

Human Growth Hormone (HGH)

HGH helps repair and rebuild tissue, supports recovery, and plays a role in healthy aging. Higher intensity resistance training has been shown to stimulate HGH release, especially when muscles are pushed close to fatigue (that MMF we talked about in the last blog!). 

Testosterone

It’s not just for the boys! Testosterone supports muscle mass, bone density, motivation, confidence, and cognitive function in both men and women. Strength training helps support healthy levels as we age.

Cortisol

Cortisol is our primary stress hormone. While chronic high cortisol can take a toll on the body, exercise creates a short, controlled stress that can actually improve our ability to recover from stress over time.

Adrenaline (Epinephrine)

Adrenaline increases focus, alertness, and energy during exercise. It prepares the body for effort and can leave us feeling mentally refreshed afterward.

Insulin

Resistance training improves insulin sensitivity, helping the body regulate blood sugar more efficiently. Stable blood sugar is strongly connected to stable mood, focus, and energy levels.

Endorphins

These are the famous “feel-good” chemicals released during exercise. They help reduce pain perception and contribute to that accomplished, energized feeling after a workout.

Estrogen & Progesterone

These hormones influence mood, sleep, cognition, energy, and recovery. Strength training may help support healthier hormonal balance, particularly during perimenopause and menopause.

Brain-Derived Neurotrophic Factor (BDNF)

Often called “fertilizer for the brain,” BDNF supports brain cell growth, learning, memory, and emotional resilience. Exercise has been shown to increase BDNF levels, which may help support long-term brain health.

Serotonin & Dopamine

While technically neurotransmitters rather than hormones, these are heavily influenced by exercise and play a major role in mood, motivation, reward, and emotional regulation. This is part of why movement can help reduce symptoms of anxiety and depression. 

Effective exercise doesn’t need to be endless to be meaningful. Even within our 15-minute strength training workout, the endocrine and nervous systems are working hard on that cellular level. Your body is releasing compounds that support recovery, resilience, focus, emotional regulation, and long-term brain health while helping burn through some of the chronic stress chemistry that can quietly wear us down over time.