Reverse Grip Tricep Extension (Skull Crusher) What muscles do Reverse Grip Tricep Extensions (Skull Crusher) work? The Reverse Grip Tricep Extension (Skull Crusher) is an isolation exercise that primary targets your triceps. It’s a strength exercise that uses push force. How to do the Reverse Grip Tricep Extension (Skull Crusher) Benefits of the Reverse Grip Tricep Extension (Skull Crusher) Tips for performing the Reverse Grip Tricep Extension (Skull Crusher) What equipment is needed to perform Reverse Grip Tricep Extensions (Skull Crusher)? What type of exercise is the Reverse Grip Tricep Extension (Skull Crusher)? How many reps you should do for Reverse Grip Tricep Extension (Skull Crusher)?