The help that muscles give for breathing?

Homework?

The diaphragm is the main breathing muscle and accounts for most, if not all, of normal tidal breathing. There are so-called accessory muscles of breathing, such as the intercostals (between the ribs) and neck & shoulder muscles, that may contribute to breathing if necessary.

The ribs curve around like the handle of a bucket. When pulled & raised by accessory muscles, the volume of the chest cavity is increased, which helps fill the lungs independent of the diaphragm moving downward.

Accessory muscles come into play mostly in abnormal conditions, but also work at a low level in normal breathing.

@gasman summarized the physiology nicely. You can learn more here.

@shilolo Thx :)