INS and polycystic ovary syndrome: Therefore, the aim of this protocol paper is to detail an exercise intervention that explores the clinical effectiveness and efficacy of HIIT compared to moderate intensity exercise or standard care (unsupervised lifestyle intervention) on metabolic (body composition and insulin sensitivity), reproductive (anti-müllerian hormone [AMH] and steroid profiles) and mental health (depression and health-related quality of life) in women with PCOS.