Kyle Garlett lived through a period where it seemed like everything was going wrong. One minute he was starting his senior year of high school and the next minute he received the three-word diagnosis that changed everything -- you have lymphoma.

His cancer returned four times and the treatment he received weakened his heart so much that he eventually required a heart transplant. But those challenges only fueled his fire for life.

Now, he's an author, motivational speaker and, believe it or not, an Ironman triathlete.

Kyle explains how he went from mapping out his future to trying to believe he even still had one. See what motivates him to keep pushing himself and his body to the limits.

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