Are these extreme young athletes pushing themselves too hard?

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/ Source: TODAY
By TODAY

As Olympians at the Rio games impress the world with their flawless routines and remarkably strong physiques, there’s another group of much younger athletes who are also pushing their bodies to the extreme. NBC’s Joe Fryer reports for Sunday TODAY on a handful of children who might be walking the fine line between healthy and unhealthy sports. (Run time: 3:45)