Stairs are a part of everyday life; you probably don’t think much of them as you’re hauling laundry up a flight or carrying the trash down. But if you’ve ever found yourself wheezing at the top of a ...

For many runners, stair climbing isn’t typically their first choice of cardio equipment. But now that it’s seeing a surge in popularity—thanks to the 25-7-2 workout on TikTok—many runners may give the ...