Sit-ups, curl-ups, and weight lifting do not stunt growth; rather, they can promote it. Growth is primarily influenced by genetics and nutrition, not by weight or muscle mass. Engaging in strength training is beneficial for building strong bones and muscles, improving posture, and enhancing overall fitness. The body's response to the stress of weightlifting stimulates muscle and bone growth through neurological processes. While sitting down during weightlifting may not directly affect growth, maintaining proper form is crucial to prevent injury and ensure effective muscle development. Additionally, a balanced diet and adequate rest are vital for healthy growth and development. Overall, strength training is advantageous and does not hinder growth.