Julia is the associate news editor for Health, where she edits and publishes news articles on trending health and wellness topics. Her work has been featured in The Heights, an independent student ...

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.

Push-ups always came easy to me. In my 20s and 30s, I could crank out more than 30 a day if I wanted to, and I loved how strong they made me feel. But the other day, when I went to do a set of 10 push ...