We all come up with our excuses for why we don’t get enough exercise. Sometimes it’s because you had a long day at work and are too wiped out. Sometimes it’s because you had a long night out and are too wiped out. And sometimes we don’t even bother with the excuses and just say, “Screw it.” But Nike’s new “Unlimited Youth” ad featuring an 86-year-old nun who has competed in 45 Ironman triathlons will make you realize how lame all those excuses are.

Sister Madonna Buder finished her first Ironman World Championship in Kona, Hawaii in 1985 at the age of 65. She became the oldest triathlete to compete in an Ironman at 82 and now at 86 has more than 40 of the 2.4-mile swim, 112-mile bike, and 26.2-mile run events under her habit. Along the way, Sister Buder also picked up the awesome nickname “Iron Nun.”

Her spirituality plays an important part in her approach to triathlon. When she struggled to finish that first race in Kona, she “thought of the finish line as the entrance to the final finish line, into the Pearly Gates.”

So, yeah, if an 86-year-old nun can do it, so can you.

Justin Tejada is a writer and editor based in New York City. Follow him on Twitter at @just_tejada and Instagram at @justin_tejada.