Throwing a baseball overhead
Biceps brachii
Action: Flexion and supination of the forearm
Innervation: C5 and C6 fibers of the musculocutaneous nerve
Deltoid
Action: Arm abduction, flexion, and extension
Innervation: Axillary Nerve
Kicking a ball
Quadriceps femoris
Action: Extend the leg at the knee joint and to flex the thigh at the hip joint.
Innervation: Femoral Nerve
Biceps femoris
Action: thigh extension, knee flexion, and external rotation of both the hip and leg
Innervation: tibial division of sciatic nerve
Doing sit-ups
Rectus abdominis
Action: Flexion of the trunk
Innervation: Thoracoabdominal nerves
Transversus abdominis
Action: Compresses abdominal viscera, trunk rotation
Innervation: Intercostal nerves, subcostal nerve, iliohypogastric nerve, ilioinguinal nerve
Breathing
Pectoralis minor
Action: aid in expanding the thoracic cavity
Innervation: Lateral pectoral nerve
Diaphragm
Action: Depresses costal cartilages, primary muscle of breathing
Innervation: Phrenic nerves