Dumbbell Skull Crushers isolate the triceps for effective strength and definition. Lie on a flat bench holding a dumbbell in each hand with arms extended above your chest. Slowly lower the dumbbells toward your forehead by bending at the elbows, then extend back to the starting position with control. This exercise enhances tricep strength, improves arm aesthetics, and supports functional upper-body movements while maintaining proper form and joint safety.