He was practicing deep breathing techniques, he had to have great control of his what?\nOptions:\n- bringing air into body bringing air into lungs\n- abdominal muscles\n- bringing air into lungs\n- air\n- oxygen Let's think step by step:
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Deep breathing uses the abdominal muscles. Abdominal muscles are a group of muscles. The intensity of using abdominal muscles requires control. So, the answer is abdominal muscles.
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