The rectus femoris muscle is one that causes a lot of issues, especially in the knee. It is a hip flexor and a knee extensor. Check out this video on how to release your rec fem yourself with a foam roller, specifically the thera roll and a massage or tennis ball.
Check out The Ultimate Self Massage Guide for more ways to get rid of quad and knee pain… or download the free quadriceps section simply by signing up to my mailing list!