Exercise is Medicine – The Science Behind Movement

By Molly Carrigan, Accredited Exercise Physiologist and Accredited Exercise Scientist GradDipExSci, BExSci, ESSAM, AEP,AES
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We all know that exercise is good for us, but did you know that it’s also one of the most powerful, evidence-based interventions available to prevent, treat, and manage chronic disease?

In fact, exercise is so effective that the global health community has embraced the motto: Exercise is medicine. As Accredited Exercise Physiologists (AEPs), we prescribe movement as part of a tailored, measurable treatment plan. It’s customised exactly to your specific needs.


What happens to your body when you exercise?

Movement affects nearly every system in your body, and here’s how:

  • Cardiovascular system (think your heart and blood vessels) – improves blood pressure, reduces cholesterol, enhances circulation
  • Respiratory system –
  • Muscular system – builds strength, endurance and functional movement capacity
  • Metabolic system – regulates blood sugar, improves insulin sensitivity, helps with weight management
  • Nervous system – supports mood, sleep, brain health, and energy levels
  • Immune system – enhances immune response and reduces inflammation

That’s why exercise is often described as a “poly-pill” – it has many benefits and few side effects when done safely.

Chronic Disease Management Through Exercise

Here’s what the evidence says about exercise for specific conditions:

1. Type 2 Diabetes

  • Exercise increases uptake of glucose by muscle, and insulin sensitivity.
  • Both resistance training and aerobic exercise lower HbA1c and fasting glucose.
  • Structured exercise can reduce or delay the need for medication.

Aim for at least 150 minutes/week of moderate aerobic activity plus 2–3 days/week of strength training.

2. Heart Disease

  • Exercise strengthens the heart muscle and lowers resting heart rate and blood pressure.
  • It improves endothelial function and reduces inflammation.
  • Cardiac rehabilitation, guided by AEPs, reduces hospital readmission and mortality rates.

3. Depression and Anxiety

  • Movement boosts dopamine, serotonin, and endorphin levels.
  • Exercise increases hippocampal volume and reduces cortisol levels.
  • It’s as effective as antidepressants for some people, with fewer side effects.

4. Osteoarthritis and Chronic Pain

  • Movement also helps rewire pain processing in the brain.
  • Exercise reduces joint stiffness and increases strength to support joints.
  • It improves function without worsening pain.
How Much Exercise Do You Need?

According to the World Health Organization, Exercise & Sports Science Australia (ESSA), and the Australian Physical Activity Guidelines:

  • Adults: 150–300 minutes of moderate aerobic activity/week
  • + 2 or more sessions/week of strength training
  • + Balance training for older adults or those at risk of falls

But here’s the catch: more isn’t always better, and individualisation matters.

That’s where working with an AEP is key. We prescribe the right dose, intensity, and type of exercise based on your goals, limitations, and medical history.

Movement is More Than Fitness — It’s Health Care

If exercise were a pill, we’d all be taking it. But unlike a pill, it empowers you to be in control of your health.

Whether you’re managing a condition, recovering from illness, or trying to stay independent as you age, exercise, prescribed correctly, can make a life-changing difference.

Need Help Getting Started?

An Accredited Exercise Physiologist can help you move safely, effectively, and confidently, no matter where you’re starting from.

Contact us today to book your initial consultation and get your personalised exercise plan.