1. Throwing a baseball overhead
- Muscle Name: Deltoid
- Action: Abducts arm; flexes and extends arm at shoulder joint
- Innervation: Axillary nerve
- Muscle Name: Pectoralis Major
- Action: Flexes and adducts the arm; medially rotates the arm at shoulder joint
- Innervation: Medial and lateral pectoral nerves
2. Kicking a ball
- Muscle Name: Gluteus Maximus
- Action: Extends the thigh; laterally rotates the femur
- Innervation: Inferior gluteal nerve
- Muscle Name: Quadratus Femoris
- Action: Laterally rotates the thigh; stabilizes hip joint
- Innervation: Nerve to quadratus femoris
3. Doing sit-ups
- Muscle Name: Rectus Abdominis
- Action: Flexes the trunk of the body
- Innervation: Intercostal nerves 7-11 and subcostal nerve
- Muscle Name: Transversus Abdominis
- Action: Flexes and laterally bends the trunk
- Innervation: Intercostal nerves 7-11; subcostal, iliohypogastric, and ilioinguinal nerves
4. Breathing
- Muscle Name: Diaphragm
- Action: Inferiorly pushes the abdominal viscera; pulls air into the lungs
- Innervation: Phrenic nerve (C3-C5)
- Muscle Name: Levatores Costarum
- Action: Elevates the rib
- Innervation: Dorsal primary rami of spinal nerves C7-T11