If you feel out of breath walking up stairs, you might wonder if your fitness or your health isn’t quite what you thought. But here’s what’s actually going on.
Even if you can run a 5K with ease, crush a 45-minute spin session, or power through a HIIT class, that looming flight of stairs can make you really start to doubt your fitness prowess—especially when you know you’ll be huffing and puffing your way up.
This higher demand forces your body to respond by increasing your heart rate and breathing rate, which is why you may arrive at the top of the staircase huffing and puffing, Hart explains.
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