Your triceps play a huge role in the pressing movements that probably make up a solid portion of your upper body training. But because the primary muscles being worked during big presses are your chest or shoulders, the triceps don’t necessarily get a lot of opportunities for growth with those moves after a certain point.
For that reason, isolating your triceps is a great way to promote triceps muscle growth. Especially when you’re a more advanced lifter, isolation exercises can help devote specific attention to any lagging muscles while giving your bigger muscles the breaks they need to come back stronger in your next session.