When the arm circumference is 30cm, what you desire is 40, and when it comes to 40cm, you desire 50 even more! Every 5cm progress of arm circumference is a very long training process.

Going a size up even in shorts sounds like an annoying thing to do.

Narrow shoulders are not terrible, the problem is to know how to train, especially if there is not enough training time.

every time a deep squat is practiced to the knees, both the circumference and strength are strong and unsatisfactory?

Since working out, have you noticed other people's pecs from time to time?

Would you choose to squat your legs on a weekday?

The same goes for chest training, doing countless push-ups, doing countless bench presses, but the upper chest is not full, how should training be arranged in order to develop a full and good looking pectoralis major muscle?

which part of your body do you spend the most time in the gym?

It's not just reaching athletes who can do this, the average fitness enthusiast can too, if you master effective methods.

You'll be able to grow your arms an extra 2cm, and you won't waste any time if you have it! If you don't have much time, you should use supersets to make your arms thicker and fuller!