Planks are an easy way to develop core strength, according to the American Council on Exercise. But for some people, they're too taxing on the toes. That can happen when your joints aren’t mobile ...

Roshini Raj, MD, is Health's former magazine's medical editor and coauthor of What the Yuck?!. Board-certified in gastroenterology and internal medicine, Dr. Raj is a Clinical Associate Professor of ...