Visualization training helps athletes to mentally prepare for competition. The process of visualization includes imagining success, focusing on goals, perfecting skills, and increasing one's ability to focus on the task at hand. 
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Answer:
The autonomic nervous system
Explanation:
The autonomic nervous system is control mechanism that operates mainly unconciously and governs body functions like heart rate, digestion, pupil response, urination, sexual excitement, and respiratory rate.
Autonomic functions require respiratory control, cardiovascular control, vasomotor activity and some reflex behaviors like coughing, swallowing, vomiting and sneezing