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Effortless Endurance

Rebuilding endurance after menopause, one experiment at a time.

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Author: Teresa

How Cortisol Walked Me Into RED-S (And Why I Didn’t See It Coming)

Posted on May 13, 2026July 7, 2026 by Teresa

I’ve been training for over three decades. I know how to plan a training block. I know what intentional stress looks like in data, and I know what recovery is supposed to look like afterward. In the spring of 2023 I was finishing a heavy training block (a deliberately high load to build fitness) and […]

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Metabolic Adaptation: When Your Body Stops Trying to Perform and Starts Trying to Survive

Posted on May 8, 2026July 7, 2026 by Teresa

Why eating less and training harder made everything worse — the thyroid-cortisol survival cascade, and what it actually takes to shift the set point.

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RED-S Doesn’t Always Look Like What You Think

Posted on May 6, 2026July 7, 2026 by Teresa

RED-S (Relative Energy Deficiency in Sport) happens when your body doesn’t have enough energy to support both basic function and training load. The typical patient is a young athlete who is severely restricting calories. I was 125 lbs, eating at a 300-calorie deficit, an experienced athlete and coach… And had no idea I qualified. I […]

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I Was in the Best Shape of My Life. Then Menopause Hit.

Posted on April 28, 2026July 7, 2026 by Teresa

Menopause snuck up on me. I was in the best shape of my life leading up to it. I was hitting PRs in the gym, I had fantastic endurance, and I was climbing hills on my bike that actually felt kinda easy. I thought perimenopause was a breeze! I didn’t experience any of the symptoms […]

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