The video explains how exercise increases the body's energy demand, requiring more glucose and oxygen for cellular respiration. It describes physiological responses like increased breathing and heart rates to supply muscles with oxygenated blood. When oxygen is insufficient, anaerobic respiration occurs, producing lactic acid and causing muscle cramps. The video also discusses oxygen debt and muscle fatigue resulting from intense exercise.

What are the products of anaerobic respiration?

What is oxygen debt and why is it significant after intense exercise?