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Throwing a baseball overhead
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biceps brachii - flexes the forearm - musculocutaneous nerve
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latissimus dorsi - extends the arm and rotates the arm medially - thoracodorsal nerve
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Kicking a ball
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quadriceps - extends the knee - femoral nerve
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hamstring muscles - extends the thigh - tibial nerve
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Doing sit-ups
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Rectus abdominis - flexes the trunk - intercostal nerves 7-11 and subcostal nerve
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abdominal oblique - flexes and laterally bends the trunk - intercostal nerves 7-11, subcostal, iliohypogastric and ilioinguinal nerves
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Breathing
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Diaphragm - pushes the abdominal viscera inferiorly, increasing the volume of the thoracic cavity - phrenic nerve (C3-C5)
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Intercostal muscles - keeps the intercostal space from blowing out or sucking in during respiration - intercostal nerves (T1-T11)