You can't increase the size of the chest for girls, it will develop naturally in its own time. The only exception would be to consider plastic surgery to increase breast size.
Girl's boobs are the bumpy things that stick out from their chest when they get older. You didn't know that? Wow... I feel sorry for you.
In boys, the increase in penis sizes and the increase in testis size is evident. In girls, there is increase in breast size and onset of menstruation.
diaphagram is that major muscle
Why would you not want to increase your arms?
It increases in size as you inhale and decreases as you exhale.
That depends on the size of the girls breast and chest measurments.
Yes, the exercise will build up the size of the pectoral muscles ("pecs").
This depends on the girl and the size of their chest. It will vary between brands and person.
To increase your chest or go up a size, there are a couple of options. A push up bra works very. The other option which I'm not to fond about is plastic surgery but that's your decision to make.
A good chest workout is to do bench presses. I think it's the best choice for working out your chest muscles. Good luck and have fun working out.
contraction of diaphram and contractio of rib muscles
Exercises such as bench press, push-ups, chest flys, and chest dips are effective for increasing the size of chest muscles. It is important to progressively increase the weight or intensity of these exercises over time to continue stimulating muscle growth. Additionally, ensuring proper nutrition and adequate rest are also crucial for muscle growth in the chest area.