The body adapts to regular exercise through several physiological changes, enhancing overall fitness. Initially, cardiovascular fitness improves as the heart becomes more efficient at pumping blood, leading to better oxygen delivery to muscles. Over time, muscle fibers adapt by increasing in size and endurance capacity, improving strength and performance. Additionally, systemic adaptations include improved metabolic processes and changes in hormone levels that enhance recovery. Enhanced neural efficiency in motor unit recruitment also occurs, resulting in better coordination and control. These adaptations contribute to improved health and athletic performance.