The effectiveness of breathing exercises continue to blow me away with their ability to overcome anxiety, it isn’t necessarily a long term solution but in the moment it is an outstanding coping skill. Doing mindful slow breathing can bring you to a feeling of being present and alleviate anxious moments.
My experience when helping an individual experiencing a panic attack or anxiety is that slow and mindful breathing can bring the individual to a feeling of calmness and grounding. It doesn’t always work, but it is an effective technique to have in your coping skills toolbox if you experience moments of anxiety or when you are helping someone in crises.