The body adapts to a new workout program through several physiological changes. Initially, the nervous system responds, improving coordination and neuromuscular efficiency. Over time, muscle fibers become stronger, and endurance increases as adaptations occur at the cellular level. These changes often include increases in mitochondrial density, enhancing energy production and utilization. Hormonal adjustments occur as well, optimizing recovery and performance. Consistent application of progressive overload—gradually increasing the intensity or volume of workouts—promotes continuous adaptation, ensuring ongoing improvements in strength and endurance.