86-year-old 'Iron Nun' featured in new Nike ad campaign

There have been some pretty amazing athletic feats at the Olympics this summer, but there's one athlete making waves who continues to push the limits at 86 years young.

Her name is Sister Madonna Buder - better known as the Iron Nun.

She's the star of the very viral, very funny new Nike "Unlimited Youth" campaign.

Sister Madonna has done 45 Ironman races and counting so far.

She is living proof that you are never too old to start reaching for your dreams.

She didn't start running until she was 48 years old and she was at 55 for her first Ironman.

To get through that, she says she channeled the divine.

"I thought of the finish line as the entrance to the final finish line, into the Pearly Gates. That's what drew me to it," she said.