Are your upper arm muscles a bit flat?

I wonder if you mean that the arms are thinner when viewed from the front, but look much better from the side.

If so, please explain two things:

1. Your frame is relatively small, and your tendons are also relatively small;

2. The brachialis muscle and the brachialis muscle The lateral head of the triceps is not developed enough;

The first point is caused by genetic factors and cannot be changed. We can start from the second point.

Strengthen the exercise of the brachialis muscle. The brachialis muscle is located on the outside of the upper arm and under the deltoid muscle. It is the assistant of the biceps brachii. In the future, you can change the ordinary curl to a hammer curl. This action Not only can it strengthen the brachialis muscles, it also has a good strengthening effect on the lateral head of the biceps brachii and the brachioradialis muscles of the forearm, which can enhance the three-dimensional sense of the arm muscles.

To strengthen the training of the outer head of the triceps brachii, try the straight bar triceps push-down to build your triceps into a "strong horseshoe."

Finally, having a small frame is not a disadvantage. If you practice hard, you will have good muscle details and separation. Come on!