Throwing a baseball overhead
Subscapularis
Action: Medially rotates arm, assists in arm extension
Innervation: Upper and lower subscapular nerve (C5,6)
Latissimus Dorsi
Action: Extends and medially rotates arm
Innervation: Thoracodorsal nerve (C7,8)
Kicking a ball
Rectus Femoris
Action: Extends leg at knee and flexes thigh
Innervation: Femoral nerve
Psoas Major
Action: Flexes thigh and laterally bends lumbar vertebral column
Innervation: Spinal nerve (L2-4)
Doing sit-ups
Rectus Abdominis
Action: Flexes trunk and compresses abdominal viscera
Innervation: Intercostal nerves (T7-11) and subcostal nerve
Transversus Abdominis
Action: Flexes and laterally bends trunk
Innervation: Intercostal nerves (T7-11), subcostal, iliohypogastric and ilioinguinal nerves
Breathing
Diaphragm
Action: Pushes abdominal viscera inferiorly and increases volume of the thoracic cavity (inspiration)
Innervation: Phrenic nerves (C3-5)
External Intercostals
Action: Keeps intercostal space from blowing out or sucking in during respiration
Innervation: Intercostal nerves (T1-11)
References:
Anatomy Tables - Muscles. (n.d.). Medical Gross Anatomy. https://www.med.umich.edu/lrc/anatomy-tables/muscles_alpha.html