When Gulie Ajania Started doing Bikram yoga – known as "hot yoga" because the temperature is cranked up to at least 100 degrees F – she gave up tea and coffee."

Because I get a high from this," she says, "I don’t need any stimulants."

Ajania, 67, is a walking advertisement for the purported health benefits of Bikram yoga. As she demonstrates postures, or asanas, for a photographer, she is lean and limber in a purple spandex outfit most women past 30 would be hesitant to put on.

And she says she has the blood pressure of a teenager.

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