Between January 25 to January 31, Ms Smith ran full marathons in Perth, Singapore, Egypt, Netherlands, New York, Chile and Antarctica. Impressive, right?
In a video posted on her YouTube channel, she explains her decision to undertake this incredible feat and her love for running. The Vietnam-born Ms Smith started running in 1990 to 'release stress and be healthier,' according to her video.
"The reason I am running the Triple 7 Quest is that I'm turning 70 next month - I thought it would be a perfect challenge to run seven marathons in seven days on seven continents to celebrate my seven decades," she says.
To complete 7 marathons in 7 different continents, Ms Smith and her group finished one race and flew to the next. Speaking to the CNN, the 70-year-old said that her most challenging race happened in Cairo when a delayed flight cut short their time for 7 hours to 6 hours.
She still managed to complete the full race in 5 hours and 51 minutes.
Watch Ms Smith's inspiring video below:
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