Tight hip flexors, especially a deep muscle called the psoas, can silently stress your spine. Here's why this muscle deserves ...

If the tailbone is sore and inflamed, overactivity of the pelvic floor and hip-opening muscles ... back. Raise the knees toward the ceiling, keeping the feet flat on the floor. Bend the left leg ...

Though they power most upright movements, the calf muscles are often overlooked in stretching routines. But tight or stiff ...