1/ Throwing a baseball overhead
Muscle: Deltoid
Action: Flexes shoulder, lifts arm forward
Innervation: Axillary nerve
Muscle: Triceps Brachii
Action: Extends elbow, straightens arm as ball is released
Innervation: Radial nerve
2/ Kicking a ball
Muscle: Gluteus Maximus
Action: Extends the hip, pulls thigh backward after kicking or during follow-through.
Innervation: Inferior gluteal nerve
Muscle: Tibialis Anterior
Action: Dorsiflexes foot when preparing to strike ball with top of the foot.
Innervation: Deep fibular nerve
3/ Doing sit-ups
Muscle: Rectus Abdominis
Action: Brings chest toward pelvis.
Innervation: Thoracic Spinal Nerve
Muscle: Iliopsoas
Action: The iliopsoas pulls thigh toward abdomen.
Innervation: Femoral nerve
4/ Breathing
Muscle: Diaphragm
Action: Contracts and moves downward during inhalation.
Innervation: Phrenic nerve
Muscle: External Intercostals
Action: Contract during inhalation, elevating ribs and expanding thoracic cavity laterally and anteriorly.
Innervation: Intercostal nerves