Different body types—ectomorph, endomorph, and mesomorph—respond uniquely to exercise and diet. Ectomorphs, typically lean and narrow, may struggle to gain muscle and benefit from a higher-calorie diet. Mesomorphs, naturally muscular, respond well to strength training, showing quicker results. Endomorphs, with a softer physique, might find it easier to gain weight and may need a more cautious approach to both diet and exercise to enhance fat loss. Understanding these types can personalize fitness and nutrition plans for optimal outcomes.