1. Increase weight and reduce repetition times: gradually increase the load during training, so that the muscles are constantly challenged, thus promoting muscle growth. At the same time, reduce the number of repetitions in each group, so that the muscles can be more fully stimulated.
2. Do a variety of actions: stimulate different parts of the arm through different actions, such as dumbbell bending, barbell belly rolling, etc. This will allow all parts of the arm to be exercised, so as to better shape the lines.
3. Control diet: A reasonable diet is very important for muscle growth. Eat enough protein, carbohydrates and fat to provide enough energy and nutrition to support muscle growth.
4. Proper rest: Muscles need enough rest time to recover and grow. Give your arm enough rest time to avoid muscle fatigue and injury caused by overtraining.