"Deep Breathing" teaches you a breathing technique to help calm you.
There are two ways to breathe: through your chest or through your belly. When stressed, we tend to take quick, shallow breaths through our chests. This makes the feelings worse. Deep, slow breathing works to calm you.
To begin, you’ll take a long, slow breath through your nose. As you breathe in, push your belly out. Once your lungs are full, hold the breath for a moment. As you inhale, your stomach should rise while your chest remains still.
Next, you’ll exhale slowly through your mouth, pulling your belly in as you do so. Try to push all the air out. The more cycles you complete, the better you'll feel. Like most things, regular practice makes this activity easier each time.