Name the additional muscles which help in increasing the strength of breathing .

Explanation

To answer the question regarding the additional muscles that help in increasing the strength of breathing, we can follow these steps:

### Step-by-Step Solution:

1. **Identify Primary Muscles**:
- The primary muscles involved in breathing are the diaphragm and the external intercostal muscles. These muscles are crucial for the normal process of inhalation and exhalation.

2. **List Additional Muscles**:
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