Heavy lifting positively affects metabolic processes by increasing muscle mass, which in turn boosts resting metabolic rate (RMR). The greater the muscle mass, the more calories the body burns at rest. Additionally, intense weight training can elevate the afterburn effect, where the body continues to burn calories post-exercise to recover. This increased metabolic rate is beneficial for weight management and can improve insulin sensitivity over time, making heavy lifting an effective strategy for enhancing overall metabolic health.