1. Throwing a baseball overhead
Muscle Name: Pectoralis major
Action: As a whole, adducts and medially rotates arm at shoulder joint
Innervation: Medial and lateral pectoral nerves
Muscle Name: Anconeus
Action: Extends forearm at elbow joint
Innervation: Radial nerve
2. Kicking a ball
Muscle Name: Piriformis
Action: Flexes and abducts thigh at hip joint
Innervation: Sacral spinal nerve S1 or S2, mainly S1
Muscle Name: Quadratus femoris
Action: Laterally rotates and stabilizes hip joint
Innervation: Nerve to quadratus femoris
3. Doing sit-ups
Muscle Name: External oblique
Action: compress abdomen and flex vertebral column
Innervation: Thoracic spinal nerves T7-T12
Muscle Name: Rectus abdominus
Action: Flexes vertebral column and compresses abdomen
Innervation: Thoracic spinal nerves T7-T12
4. Breathing
Muscle Name: Diaphragm
Action: Contraction of this muscle causes it to flatten and increases vertical dimension of thoracic cavity
Innervation: Phrenic nerve, contains axons from cervical spinal nerves (C3-C5)
Muscle Name: External intercostals
Action: Contraction elevates ribs and increased anteroposterior and lateral dimensions of thoracic cavity
Innervation: Thoracic spinal nerves T2-T12