1. Throwing a baseball overhead
a. Subscapularis
Action: Shoulder joint - Arm internal rotation
Stabilizes humeral head in glenoid cavity
Innervation: Upper and lower subscapular nerves
b. Deltoid
Action: flexion and internal rotation of the arm
Innervation: Axillary nerve
2. Kicking a ball
a. Quadriceps
Action: Thigh flexion and Leg extension
Innervation: Femoral Nerve
b. Hamstring
Action: Flexion of leg, extension of thigh, stabilization of knee and hip joints
Innervation: Tibial and common fibular divisions of sciatic nerve
3. Doing sit-ups
a. Rectus Abdominis
Action: Trunk flexion and compresses abdominal viscera
Innervation: Intercostal and subcostal nerves
b. Internal Abdominal Oblique
Action: Compresses abdominal viscera and trunk flexion
Innervation: Iliohypogastric nerve, ilioinguinal nerve, intercostal and subcostal nerves
4. Breathing
a. Scalenus medius
Action: Neck lateral flexion, elevates ribs
Innervation: Anterior rami of spinal nerves
b. Serratus anterior
Action: Draws scapula anterolaterally, suspends scapula on thoracic wall
Innervation: Long thoracic nerve
References: Tortora, G. J., & Derrickson, B. (1975). Principles of Anatomy & Physiology. http://ndl.ethernet.edu.et/bitstream/123456789/1717/1/36%2c2012.pdf.pdf