I'm a little confused about tricep training. I know there are three heads of the tricep, as seen here: http://www.exrx.net/Muscles/TricepsBrachii.html.
So what exercises work what head? So far for my tri workout I'm doing three push down exercises with three different grips: 1) rope push down, 2) reverse (palms up) pushdown, and 3) pushdown with the v-bar. Which part of the tri heads do each of those work?