10/13/2026
The exact same workout can build strength in one woman and leave another completely depleted.
And it isn't necessarily about fitness level or how hard she's willing to work.
HIIT, heavy lifting, and intense cardio are deliberate physical stressors. That's part of what makes them effective. Your body responds to the challenge, recovers, and gradually adapts.
But what happens when recovery is already falling behind?
Poor sleep, ongoing stress, inadequate nutrition, and hormonal changes can all affect how well your body responds to additional demands.
Cortisol plays an important role here. It helps regulate energy availability and your response to stress, but its activity is influenced by what's happening throughout the day, not just during your workout.
The same principle applies to two wellness practices gaining popularity: fasting and cold plunges.
Both introduce physiological stress. And just because something is considered healthy doesn't mean more of it, or doing it more intensely, will automatically produce better results.
Here's something worth paying attention to:
After a demanding workout, fasting period, or cold plunge, do you feel clear, steady, and able to recover? Or do you end up wired, foggy, unusually exhausted, or crashing a few hours later?
Those responses are useful clues. They don't diagnose a cortisol imbalance, but they can help identify when your current routine needs a closer look.
This is why I consider cortisol rhythm alongside sleep, nutrition, hormonal patterns, metabolic health, and daily demands. When appropriate, testing cortisol at multiple points throughout the day can provide additional information, but the results need to be interpreted in context.
The goal isn't to see how much stress your body can tolerate. It's to find the level of challenge it can actually recover from and adapt to.
Have you ever tried a popular wellness practice that was supposed to make you feel better but ended up leaving you more depleted?
Yelena Tselenchuk, BCDHH, BCN, BCHP