1. Throwing a baseball overhead
- Deltoid
Action: flexion and internal rotation of the arm, abduction of the arm, and extension and external rotation of the arm.
Innervation: Axillary nerve
- Pectoralis Major
Action: arm adduction, arm internal rotation, arm flexion, arm extension, and draws scapula anteroinferiorly
Innervation: Lateral and medial pectoral nerves
2. Kicking a ball
- Biceps Femoris
Action: thigh extension, thigh external rotation, leg flexion, leg external rotation, and stabilizes pelvis
Innervation: tibial division of sciatic nerve and common fibular division of sciatic nerve
- Gluteus Maximus
Action: Thigh extension, thigh external rotation, thigh abduction, thigh adduction
Innervation: Inferior gluteal nerve
3. Doing sit-ups
- Rectus abdominis
Action: Trunk flexion, compresses abdominal viscera, expiration
Innervation: intercostal and subcostal nerves
- External Oblique
Action: Trunk flexion, compresses abdominal viscera, expiration, Trunk lateral flexion, trunk rotation
Innervation: intercostal nerves, subcostal nerves, iliohypogastric nerve
4. Breathing
- Diaphragm
Action: Depresses costal cartilages, primary muscle of breathing/inspiration
Innervation: Phrenic nerves
- Intercostal muscles
Action: Mechanical support to the thoracic cage, accessory respiratory muscles
Innervation: intercostal nerves