i work on my triceps doing the kick backs, dips and the pull downs. but my tricep heads arent showing. the exterior heads are defined but the interior heads arent showing. i dont have that V or upside down horse shoe. i just have the slash. my triceps are getting stronger. i can do more dips, heavier kickback and the pull downs but no defenition. i do 4 x 10-12reps on the kick backs and pull downs. and i do like around 10 dips rest and try to do 10 more and rest and do as many as i can up to 10 for 4 - 5 reps with decent amount of rest.