1. Throwing a baseball overhead
a) Deltoid Muscle
Action: Abducts and laterally rotates the arms
Innervation: Axillary nerve
b) Triceps Brachii
Action: Extension of the elbow joint
Innervation: Radial Nerve
2. Kicking a ball
a) Quadriceps Femoris
Action: Extension of the knee and flexion of the hip
Innervation: Femoral nerve
b) Hamstrings
Action: Knee flexion and hip extension
Innervation: Sciatic nerve
3. Doing sit-ups
a) Rectus Abdominis
Action: Flexes the trunk
Innervation: Intercostal and subcostal nerves
b) Internal Oblique
Action: Trunk flexion and rotation
Innervation: Lower intercostal nerves, subcostal nerve, iliohypogastric and ilioiniguinal nerves
4. Breathing
a) Diaphragm
Action: Contracts to expand the thoracic cavity
Innervation: Phrenic nerve
b) External intercostal muscle
Action: Contracts to elevate ribs
Innervation: Intercostal nerves