CNN Chief Medical Correspondent Dr. Sanjay Gupta told "Extra's" Renee Bargh he believes America definitely has a health problem. "We went from being one of the fittest nations on the planet to being one of the fattest, unfortunately. But it's a totally fixable problem."

The neurosurgeon has been helping to change the lives of seven lucky viewers chosen to train with him for the Annual Nautica Malibu Triathlon. The doc explained, "They're going to compete here in Malibu with us in September."

Watch the video for some valuable tips, and find out the "one healthy practice you should be doing every day"!

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