Dr. Stacey Sims

Dr. Stacey Sims is an internationally renowned exercise physiologist and nutrition scientist whose groundbreaking research on female physiology has reshaped how women train, recover and fuel their bodies. A bestselling author of ROAR and Next Level, Stacey has worked with elite athletes across the globe and is redefining what optimal performance looks like for women at every life stage.

In this first of a three-part series, Sarah Grynberg and Dr. Sims dive deep into the science of hormones, supplements and exercise - unpacking what’s really happening in the female body, how our needs shift through each hormonal phase, and the practical ways we can work with our biology instead of against it. With clarity and candour, Stacey explains why blanket fitness advice often fails women, and what we can do instead to feel stronger, sharper and more in tune with our bodies.

You’ll learn:

The truth about hormonal fluctuations and how they affect training, recovery and energy levels

Which supplements matter most at each life stage — from iron and creatine to vitamin D and magnesium

How lifestyle, movement and brain stimulation can protect cognition, mood and longevity as we age

This episode is an empowering reminder that understanding our biology is the first step to reclaiming our health - and that small, science-based choices can completely transform how we feel day to day.