A sturdy core enables more powerful movements of the upper and lower extremities. Take pitching or hitting in baseball for example. The potential for a 100 mph pitch or an out-of-the-park home run swing is generated from the hips, not the arms. Take marital arts as another example, the force behind the kick comes from the strength, stability, and adequate use of the hip muscles.

A weak or inflexible core impairs how well your arms and legs function. A strong core = power or proximal stability for distal mobility. A strong core also improves lower extremity balance and stability. This can help prevent falls and injuries during sports or other activities.