Why extreme fitness is booming: 'I got kind of addicted'

Why extreme fitness is booming: 'I got kind of addicted'

Dan Page for BI

I had never run more than 3 miles in my life when I signed up for my first half-marathon. It was the month after I turned 25, and all my friends were signing up. On social media, people in their 20s were describing marathon training as their "quarter-life crisis."

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