Articles by Dr Stacy Sims

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The Evolution of Menstrual Cycle Training

Why We’ve Moved on from “Train by Your Phase.” For years, the conversation about women’s training centered on the menstrual cycle: do high-intensity work in the follicular phase, focus on endurance in the luteal phase, and rest during your period. (And for transparency here, I was one of the ...

by Dr. Stacy Sims — Oct 14, 2025 hormones menstrual cycle period tracking training

What Racing Kona Taught Me

Racing Kona Taught Me More Than I Ever Expected In October 2000, I stood on the start line of the Ironman World Championship in Kailua-Kona, Hawaii. I had no idea that day would shape the rest of my career—not just as an athlete, but as a scientist. Kona is brutal. It’s long, hot, humid, wind...

by Dr. Stacy Sims — Oct 06, 2025 fueling heat hydration nutrition training

Train for Power—Not Just Strength

Most active women love to move. Whether it’s running, riding, swimming, lifting, yoga, or simply chasing your kids around, we love to break a sweat and feel the physical and mental benefits that come from that. But there’s one form of training that too often gets overlooked: power training. W...

by Dr. Stacy Sims — Sep 19, 2025 fueling lift heavy longevity strength training

Why Heat Impacts Women Differently

With heat waves sweeping across parts of the U.S. and Europe, summer training just got a lot more intense. As an active woman, you might already feel the difference—more fatigue, maybe some gut issues, and a general sense that your usual hydration or fueling strategy just isn’t cutting it. You’...

by Dr. Stacy Sims — Jul 10, 2025 heat hydration recipes training

ROARing into the New Year

The new revised edition of ROAR is out! Here’s what’s new. When I started working on ROAR nearly ten years ago, it was still considered fringe to say that women’s unique hormones and their menstrual cycles could impact everything from performance to injury risk to hydration and beyond. That was ...

by Dr Stacy Sims — Oct 14, 2024 nutrition roar training

Resistance Training Is Finally Getting the Respect It Deserves for Health and Longevity

Lifting weights is now recognized as good for more than “just” making muscle. For decades, aerobic exercise was regarded as the primary form of exercise you should do for cardiovascular and other health benefits. Heck, that’s why endurance type exercise such as walking, biking, and running are c...

by Dr Stacy Sims — Oct 14, 2024 intensity lea muscle training

What Women Need to Prioritize Instead of Zone 2

The popular zone 2 protocol doesn’t work the same way for women. Here’s what to do instead. I have previously reviewed, down to the cellular level, why zone 2 training, which is currently being promoted across the internet as the priority training for health, longevity, and performance, isn’t as...

by Dr. Stacy Sims — Oct 14, 2024 intensity lift heavy training zone

How to Fuel to Compete in the Heat

Staying on top of nutrition becomes more challenging as the temperatures rise. With much of the US stuck in sweltering late summer temps, the seasons changing in the Southern Hemisphere, and Kona right around the corner, I thought it would be a good opportunity to talk about a training and racin...

by Dr Stacy Sims — Oct 14, 2024 fueling heat hydration training

Why ChatGPT Isn’t Your Best Coach

You’re better off picking up a women’s fitness magazine from the nineties. As a scientist, I love tech. I’ve been experimenting and helping develop artificial intelligence systems, especially in the realm of women-specific exercise training, for several years. And when it comes to developing wor...

by Dr Stacy Sims — Oct 14, 2024 coaching training

Women Need Strength for Life

Research shows that lighter weights and higher reps can build muscle, but it’s important that we prioritize strength and power. Anyone who follows me knows that I tell women they need to prioritize strength training in their workouts and that they need to include days where they lift heavy sh*t....

by Dr Stacy Sims — Oct 14, 2024 lift heavy muscle strength training

How to Track Your Menstrual Cycle

Take your performance to the next level by understanding your unique physiology. In the summer of 2019, the U.S. Women’s National Team (USWNT) won the World Cup, making it the U.S. women’s fourth World Cup title. They scored a record-setting 26 goals throughout the tournament and also made histo...

by Dr. Stacy Sims — Oct 14, 2024 contraception hormones menstrual cycle perimenopause period tracking training

Why Menopausal Women Need Polarized Training

Donating blood is great. But you don’t need to give a pint to gain fitness as new research may suggest. Women are not small men. It’s been my mantra for well over a decade. In recent years, the scientific community has been catching up and calling attention to sex differences in exercise adaptat...

by Dr Stacy Sims — Oct 13, 2024 menopause perimenopause training

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