Answer: gasping

AnswerCrossword Clue
GASPINGLike many a marathon finisher
GASPINGRecovering from a sprint, say
gaspingStrain to take a deep breath
gaspingSay (something) while catching one's breath, esp. as a result of strong emotion
gaspingInhale suddenly with the mouth open, out of pain or astonishment
gaspingthe act of gasping