I have little knowledge of what actual body parts are, but does anyone know the two things (tendons? ligaments?) that run down the back side of your leg behind your knee? After a 5 miler on saturday mine were very tight, i tried to find a stretch to loosen them up but nothing seemed to isolate that area. I have sense just been doing the eliptical because it seems to not put as much stress on it but would like to get back into running. Anyone have a clue what i am talkin about?