Factors influencing individual responses to physical training include genetics, age, nutrition, and overall health. Each person's body adapts differently to exercise due to variations in muscle fiber composition, hormone levels, and metabolism. Genetics plays a significant role in determining strength potential, endurance capacity, and body composition changes in response to training. Additionally, age-related factors impact recovery and performance. Nutritional habits and lifestyle choices also affect how well one responds to training. Recognizing these factors aids in creating personalized workout plans that optimize results.