Dumbbell skull crushers, also known as lying triceps extensions, are a strength-training exercise that targets the triceps muscle group. To perform this exercise, lie on your back with your knees bent and your feet flat on the ground. Hold a dumbbell in each hand with your arms extended towards the ceiling. Slowly lower the dumbbells towards the sides of your head by bending your elbows, then extend your arms back up to the starting position. This movement primarily engages the triceps brachii muscle, which is responsible for elbow extension.

When performing dumbbell skull crushers, the triceps muscle fibers are activated through a process known as eccentric contraction. During the lowering phase of the exercise, the triceps muscles lengthen under tension, causing microscopic tears in the muscle fibers. These tears are repaired during rest and recovery, leading to muscle growth and increased strength. Additionally, the exercise also engages the anterior deltoids, upper pectorals, and serratus anterior muscles.

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