The psoas is a large, powerful muscle that runs from the lower back to the femur (thigh bone). Lunges and other psoas stretches can help relieve tension in the psoas muscle. Share on Pinterest Tony ...

When elite ultrarunner Mike Wolfe laced up for a tempo run in June 2009, his right hip flexor felt tender and sore. But nothing out of the ordinary for a runner who, in a weekend, can cover 75 miles ...