The single-arm dumbbell skullcrusher is a triceps exercise that has been a staple of bodybuilders for decades. Skullcrushers are usually performed for moderate to high reps, such as 8-12 reps per set or more, as part of an upper-body or arms-focused workout.
Builds muscle and strength in the triceps
Targets the long head specifically
The single-arm variation means the mind-muscle connection can be focused on one triceps at a time