1. Throwing a baseball overhead
Muscle 1: Deltoid
Action: Shoulder flexion and internal rotation
Innervation: Axillary nerve
Muscle 2: Triceps Brachii
Action: Elbow extension and shoulder extension
Innervation: Radial Nerve
2. Kicking a ball
Muscle 1: Quadriceps
Action: Knee extension and hip flexion
Innervation: Femoral nerve
Muscle 2: Gluteus Maximus
Action: Hip extension and external rotation
Innervation: Inferior gluteal nerve
3. Sit-ups
Muscle 1: Rectus abdominis
Action: Trunk flexion
Innervation: Thoracoabdominal nerve
Muscle 2: Iliopsoas
Action: Hip flexion
Innervation: Femoral nerve
4. Breathing
Muscle 1: Diaphragm
Action: Contracts to flatten and increase thoracis cavity volyme, causing air to enter the lungs
Innervation: Phrenic nerve
Muscle 2: Internal Intercoastals
Action; Depresses the ribs, reducing thoracc cavity volume during forced exhalation
Innervation: Intercostal nerves