During strength training, physiological changes such as muscle hypertrophy, increased neuromuscular efficiency, and enhanced bone density occur. Muscle fibers experience micro-tears, leading to rebuilding and growth. Hormonal adaptations, including increased levels of testosterone and growth hormone, also support muscle development. Additionally, strength training can improve metabolic rate, leading to greater caloric expenditure both during and after workouts, known as excess post-exercise oxygen consumption (EPOC). These changes contribute to overall strength, endurance, and physical performance.