Different body types respond to training programs in various ways due to genetic predispositions, metabolism, and muscle distribution. The three common body types—ectomorph, mesomorph, and endomorph—each have unique characteristics. Ectomorphs typically have a faster metabolism and may struggle to gain weight; they benefit from strength training focused on building muscle mass. Mesomorphs are naturally muscular and may respond well to a balanced mix of strength and cardiovascular workout. Conversely, endomorphs often store fat more easily and may find high-intensity training more effective for weight management and developing muscle while minimizing fat gain.