1. Throwing a baseball overhead
- Deltoid
- Action: arm abduction, stabilizing the shoulder, (anterior) assists with flexion, and (posterior) assists with extension
- Innervation: Axillary nerve
- Triceps brachii
- Action: extends forearm at elbow joint and extends arm at shoulder joint
- Innervation: Radial nerve
2. Kicking a ball
- Gluteus maximus
- Action: thigh extension at hip joint, thigh lateral rotation
- Innervation: Inferior gluteal nerve
- Quadriceps femoris (Rectus Femoris)
- Action: extends leg at the knee joint and flexes thigh at the hip joint
- Innervation: Femoral nerve
3. Doing sit-ups
- Rectus abdominis
- Action: flexes the vertebral column and compresses abdomen
- Innervation: Thoracic spinal nerve (T7-T12)
- External Oblique
- Action: Flexes and rotates the trunk while compressing the abdomen
- Innervation: Thoracic spinal nerve (T7-T12) and the iliohypogastric nerve
4. Breathing
- Diaphragm
- Action: contracts to expand thoracic cavity (inhalation)
- Innervation: Phrenic nerve (C3-C5)
- External Intercostals
- Action: Lifts the ribs during inhalation
- Innervation: Intercostal nerves (T1-T11)