Once again, 30-day fitness challenges are all the rage on social media. Whether it's a family workout challenge, a flat-abs-in-30-days challenge, or a popular 10-minutes-of-yoga-a-day-for-30-days ...

Women's Health may earn commission from the links on this page, but we only feature products we believe in. Why Trust Us? Here at Women’s Health, we love a challenge. That’s because an epic, ...