William J. Kole, writing for the Associated Press:

The Massachusetts marathoner, who won the 2016 World Marathon Challenge — seven marathons in seven days on all seven continents — will attempt to become the only person to twice complete the odyssey, which begins in Antarctica on Jan. 30 and ends in Miami on Feb. 5.

Why? “I’m certifiably crazy,” the Belmont woman jokes.

The Associated Press caught up with Pizzi, 37, a single mom with a singular mission:

AP: Why in God’s name would you do this again?

Pizzi: The locations! I get to run marathons in Novo, Antarctica; Cape Town, South Africa; Perth, Australia; Dubai, United Arab Emirates; Lisbon, Portugal; Cartagena, Colombia; and Miami. I love to run and I love to travel. I’m literally seeing more of the world, which is really fun for me.