The Eastern practice of yoga has become a modern-day symbol of peace, serenity and well-being in the West. More than 20 million Americans practice yoga, according to the 2012 Yoga in America study, with practitioners spending more than $10 billion a year on yoga-related products and classes.

The mind-body practice is frequently touted for its ability to reduce stress and boost well-being, but it also offers wide-ranging physical health benefits that rival other forms of exercise. While the scientific research on yoga's health benefits is still young, here's what we know so far about its potential effects on the body. View the infographic below and scroll down for more detailed information.

Infographic by Jan Diehm for The Huffington Post

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After Class.

Improved Brain Function. Just 20 minutes of Hatha yoga -- an ancient form of the practice that emphasizes physical postures rather than flow or sequences -- can improve cognitive function, boosting focus and working memory. In a University of Illinois study, participants performed significantly better on tests of brain functioning after yoga, as compared to their performance after 20 minutes of vigorous aerobic exercise.

Lower Stress Levels. Yoga's stress-busting powers may come from its ability to lessen the activity of proteins that are known to play a role in inflammation, according to a study published last year from University of California, Los Angeles researchers.

Alter Gene Expression. A small Norwegian study suggested that yoga's many healthy benefits might come from its ability to alter gene expression in immune cells.

Increased Flexibility. A recent Colorado State University study found that Bikram yoga -- a form of yoga in which a series of 26 postures are performed for 90 minutes in a heated room -- is linked with increased shoulder, lower back and hamstring flexibility, as well as greater deadlift strength and decreased body fat, compared with a control group.

After A Few Months.

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How Yoga Changes Your Body, Starting The Day You Begin (INFOGRAPHIC)