Around a month ago, I ran a 5K and followed it with a full-body dumbbell workout. Halfway through a set of renegade rows, I felt something go in my back. It didn't hurt too much immediately, but it ...

Tight hip flexors, especially a deep muscle called the psoas, can silently stress your spine. Here's why this muscle deserves more attention—and how to strengthen it. Lower back pain is often blamed ...