I'm sure you've been told that your depression, your fear, and your anxiety is all in your head. Actually, it may all be in your ass. That's thanks to the psoas major muscle, sometimes called the ...

With weak glutes, the body must find other ways to propel itself forward. The hamstrings and the erector spinae (lower back muscles) are forced to overwork. This leads to chronic hamstring tightness ...

MRI shows selective psoas and rectus atrophy with reduced trunk strength in chronic low back pain, suggesting functional imbalance.