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This year marks the 10th anniversary of the U.S. Department of Health and Human Services designating September National Yoga Month. Today, close to 40 million Americans practice this ancient technique for health and well-being — and that is double the number from 2012.

According to a survey conducted by Yoga Alliance, the five top reasons for practicing yoga are flexibility, stress relief, general fitness, improvement of overall health, and physical fitness.

But research shows there are many more benefits. The practice helps prevent diabetes, cognitive decline, and cardiovascular disease, and might even increase longevity.