The common theme I've noticed this week with my clients is they are experiencing Psoas issues. I assume it's for the same reason I'm rolling my shoulders in for protection from the cold. We will blame it on the cold. Sometimes when the Psoas muscle is tight it can cause issues in the hips, legs, and low back.
To stretch the Psoas muscle do a runners lunge with the back knee to the ground. Keep your hips stacked forward and in alignment with your shoulders.
To intensify the stretch on the left side begin in a right leg runners lunge, meaning the right leg is in front and left leg behind. Raise the left arm up with your bicep by your ear. Do the stretch on both sides and hold for 6-10 full breaths on each side. Or go to a YOGA CLASS! haha!