Crimson Garnet
Try the dumbbell exercise where you lean over something or in general, and twist as you're going up. This is more for the side triceps but it might work. Typically, I just do hand squeeze exercises.
저는 팔뚝에 좋은 운동을 알아내려고 노력하고 있습니다. 팁을 주시면 감사하겠습니다.