Resistance training positively affects body composition by increasing muscle mass and reducing body fat. As individuals engage in regular resistance exercises, their metabolism can become more efficient, leading to a higher resting metabolic rate. This shift facilitates greater calorie expenditure, which can help achieve or maintain a healthy weight. Increased muscle mass not only improves aesthetics but also enhances overall strength and functional ability, contributing to better health outcomes and longevity. Consequently, resistance training is essential for a well-rounded fitness regimen.