elitefts Skull Long Sleeve T-ShirtIf you're anything like us, skull crushers come to mind when you read the word SKULL. So, let's iron out proper execution for these triceps builders. Skull crushers are a classic tricep exercise that most people probably recognize. They tax the medial and long head of the tricep very hard and should probably be a staple in most beginner training programs for direct tricep work. Think of these as a supplemental exercise for a close grip bench press.