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Throwing a baseball overhead
Triceps brachii
Action: Extends forearm at the elbow joint, flexes arm at shoulder joint
Innervation: Musculocutaneous nerve
Latissimus dorsi
Action: Extends, adducts, medially rotates arm at shoulder joint, draws arm inferiorly and posteriorly
Innervation: Thoracodorsal nerve
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Kicking a ball
Vastus lateralis
Action: Extend leg at knee joint
Innervation: Femoral nerve
Biceps femoris
Action: Flexes leg at knee joint and extends thigh at hip joint
Innervation: Tibial and fibular nerves from sciatic nerve
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Doing sit-ups
External oblique
Action: Compress abdomen and flex vertebral column
Innervation: Thoracic spinal nerves T7-T12 and the iliohypogastric nerve
Transversus abdominis
Action: Compresses abdomen
Innervation: Thoracic spinal nerves T8-T12, iliohypogastric nerve, ilioinguinal nerve
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Breathing
Diaphragm
Action: Contraction causes it to flatten and increase vertical dimension of thoracic activity resulting in inhalation; relaxation results in exhalation
Innervation: Phrenic nerve
External intercostals
Action: Contraction results in inhalation; relaxation results in exhalation
Innervation: Thoracic spinal nerves T2-T12