Surprising Facts About Running

It’s no secret that we’re big fans of running here at Health. Running burns calories, builds muscle, busts stress, and boosts your heart health. Plus, it’s super convenient—just grab a pair of sneakers and go!

In honor of National Running Day, here are some interesting tidbits about running and racing.

Runners are getting adventurous…and dirty
Last year, more people completed obstacle races and mud runs than marathons and half-marathons. These non-traditional races had an estimated 4 million finishers in 2013. (But the 5K is still the most popular race distance, with more than 6.2 million finishers in 2012, says Running USA.)

Your boobs move way more than you think
Researchers from the University of Portsmouth in England have found that breasts don’t just bounce up and down during running; they also move side to side and in and out, creating a complicated figure-8 pattern. This so-called breast displacement could permanently damage the Coopers ligaments and lead to premature sagging. That’s why it’s super important to have supportive sports bras that minimize bouncing as much as possible, but are comfortable enough that you don’t hate to wear them.

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You’re fastest in your 20s
Over the marathon distance, at least. Spanish researchers looked at the ages and finishing times of runners in the 2010 and 2011 New York City Marathon and found that men run their fastest marathon at age 27; women at 29. Times were 4% slower for every year younger than these ages, and 2% slower for each year thereafter. Meaning an 18-year-old marathoner runs about as fast as a 60-year-old finisher.

…but people run long distances well into their 90s
The oldest person to run a marathon is Fauja Singh, who at 101 completed the 2012 London Marathon in 7:49:21. The oldest female marathon finisher on record is Gladys Burrill, who at age 92 ran the 2010 Honolulu Marathon in 9:53:16, according to Runner’s World.