Even a powerhouse singer like Carrie Underwood gets winded every now and then. She posted a picture on Instagram during her show in Denver. Having visited there last summer, I can tell you that the thin air does make a difference in your breathing and energy. One can only imagine how winded she must feel after belting out her songs!

Underwood writes, "In high altitudes, they put oxygen in my dressing room under the stage! This is me before the encore."

Check out more photos of Carrie Underwood >> 

(Photo courtesy of Carrie's Instagram account)

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