Resistance training alters body composition by promoting an increase in lean muscle mass while reducing fat. This shift occurs because strength training stimulates muscle hypertrophy, leading to greater calorie expenditure even at rest. Increased muscle mass boosts metabolism, allowing individuals to burn more calories throughout the day, contributing to improved body fat percentages. Furthermore, forms of resistance training help improve bone density, enhance strength and functional capacity, and refine overall body shape. Over time, these changes can significantly enhance an individual's health and fitness level.