That's good but early start times are not exclusive to the US or places where sports and bussing introduce the same kinds of constraints. There are more convincing explanations for this, such as: it doesn't work when kids have to be to school at the same time parents need to be at work - staggering the morning routine and drop-off times and all. Plus, who is starting school at 6:15? Are you talking about an opt-in zero hour? That is by choice. If starting that early is bad for your academics or health, the choice is clear, drop the sport.