Recently, I have been hitting my legs hard, on leg days. Now I am having trouble stretching. I can normally palm the ground behind my heels; but now, it's a bit more painful for me to palm the ground in front of my toes. (The pain is behind the knee.) I have been: - Squating - Doing leg curls - Doing leg extentions - Doing Caf raises Is this tauntness due to my increased attention given to my legs than before?