A frequent source of lower-back pain comes from two muscles you might not have heard of—and that makes sense since you rarely see them on those medical posters of human anatomy in doctor's offices.

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 ...

Scientists went deep to discover the cause of low back pain in runners, exploring the role of deep core muscles in back ...

If you want to strengthen your deep core, Walters and King both say that Pilates is a great workout to do regularly. “Rather ...

You’ve probably seen it all over your feeds: Fitness pros and physical therapists talking about “training the deep core.” But unlike crunches or Russian twists, these exercises don’t come with a pump ...

“Engage your core” is a term we often hear to avoid back injury during strenuous activity. It should go without saying that bracing one’s core is beneficial when lifting a wine box off the ground, ...

Add Yahoo as a preferred source to see more of our stories on Google. When you buy through links on our articles, Future and its syndication partners may earn a commission. Credit: Getty Images / ...

Struggling with stairs or shopping bags? Learn which five muscles matter most as you age and the safest exercises to keep you ...