I triggered my traps by doing shoulder shrugs for many years and it's been one year and everytime I do military press I trigger my traps. Everyone is different, but dude, for some reason you are giving me advice yet you have no clue what muslce's work out what. I have been workngout out for 10 years and have a master's in exercise physiology and can tell you that almost all shoulder movements will trigger a trap response. I am simply asking adivce on triceps, and your teling me shoulder press? you have no clue.