Many of the symptoms of anxiety arise due to the stress response disengaging the diaphragm from the process of respiration. 
https://midlmeditation.com/meditation-for-anxiety

Re-engagement of the diaphragm in autonomous breathing switches off chest hyperventilation and allows depleted C02 levels to re-balance. This results in a decrease in anxiety symptoms such as hyperventilation, tightness of chest, mental dullness, agitation and restlessness which make us defensive and affects our social interactions with others.

MIDL Mindfulness Meditation

Meditation for Anxiety: Retrain Your Breathing Patterns

In MIDL Insight Meditation 04 you change your focus from observing the elemental experience of your body in the previous training, to developing the skill of observing any habitual movements of your attention. 
https://midlmeditation.com.au/main-meditation-menu

Insight Meditation 04: Observe Attention Move

Stephen Procter

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