I also always like to mention there are empirical studies that suggest kids who are focused on developing in a well-balanced way–including not just academically but creatively, socially, physically, and ethically–tend to end up performing better academically in the long run anyway.
So it is not like you have to choose between an active, happy childhood that helps you develop well as a person or becoming a person who is well-prepared for college admissions and success in college. The first is actually critical to the second.