second wind

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second wind

(wĭnd)
n.
1. The return of relative ease of breathing after the initial exhaustion that occurs during continued physical exertion.
2. Restored energy or strength.

sec·ond wind

(sek'ŏnd wind)
Colloquial term to describe relief from general feelings of distress that often accompany the early stages of exercise; generally related to the achievement of a steady state of pulmonary ventilation, aerobic metabolism, and thermal balance as exercise progresses.