It’s mostly noticed in schools, playgrounds, and even homes—boys tend to run, jump, climb, and move around more than girls. While not true for every child, many studies have shown that, on average, boys are more physically active than girls from early childhood. But why does this happen? Is it just because of upbringing, or is biology playing a role too? Science offers some fascinating insights into why boys often appear more energetic and active. Here’s what we need to know about why it happens.