I recently did a challenge that was 100 push ups a day AND 100 pull ups a day for a whole month. It was pretty tough at first, but after about a week of it I felt like I could keep going on autopilot.

When YouTuber Scott Luu realized he was out of shape and his conditioning had slipped, he decided to test himself with a simple but demanding routine. For 30 straight days, he aimed to hit 50 pull ups ...

Another day, another challenge is sweeping across social media platforms. While the newest one doesn’t require people to ...