High-intensity exercise is often promoted as the fastest way to burn fat and boost fitness. But many women find that doing too much HIIT leaves them exhausted, inflamed and struggling with stubborn belly fat.

In this episode, I explain why much of the exercise research behind HIIT has focused on male physiology, and how women's bodies respond differently to repeated high-intensity stress. We explore the role of cortisol, recovery and metabolic adaptation — and why pushing harder doesn't always lead to better results.

I also share how to build a more supportive movement routine that improves strength, energy and metabolic health without overwhelming your nervous system.

Thank you to Revive Active for supporting this episode of the podcast. If you are a regular exerciser and want to support your joint health then their Joint Complex is the one for you - don't forget to use code Wendy10 for 10% off at checout.

Research & further reading

High-intensity exercise increases cortisol as part of the normal stress response. When training intensity is frequent and recovery is limited, cortisol can remain elevated. Research suggests chronically elevated cortisol may contribute to increased abdominal fat storage and reduced metabolic efficiency, particularly in women.

Sources:

• Hackney (2006) Stress and the neuroendocrine system in exercise https://pubmed.ncbi.nlm.nih.gov/16503658/

• Thuma et al. (2021) Exercise intensity, cortisol and recovery https://pubmed.ncbi.nlm.nih.gov/33863840/

• AZ Performance Institute (2024) – Cortisol, training load and recovery https://azperformanceinstitute.com/research/

Why high-intensity exercise is less effective on women's bodies