NSCA Sprinting And Running Practice Test

During maximum velocity sprinting, the mouth and jaw posture should be:

Open, sag Closed, clenched Slightly open, tense jaw Mouth closed, lips pressed

Correct Answer:

Open, sag

Explanation:

During maximum velocity sprinting, breathing demands are extremely high, so the mouth should be open and the jaw relaxed. An open, relaxed jaw minimizes facial and neck muscle tension, helping keep the head stable and allowing quick, efficient airflow to meet the body's oxygen needs. Clenching or tensing the jaw adds unnecessary muscle activity in the neck and face, which can disrupt breathing rhythm and head position, reducing efficiency. Closing the mouth or keeping the jaw tense wastes energy and can restrict airflow when it’s most needed. Keeping the mouth open with a relaxed jaw best supports breathing and head stability at top speed.

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