It looks good because it shows that you have interests that you are able to balance with your academic load. Don't forget that there are things that look way better on your application than sports.
Volunteer
Work for congress
Science Fairs (contests & such)
Academic Awards
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You do not have to be good at sports or be on a sports team to get into a sports school. However being good at sports might increase your chances of getting in. But if you are smart and you really want to get in I would try to get in
Yes-usually you don't need to be perfect but you do need to have a decent gpa (the school will have decided on this gpa in advance) and be eligible to play in both high school and College Sports.
No. Scholarships are available for academic achievement, community service, as well as essay contests.
It all depend's on what scholarship. If it is related to football, then yes, of course you have to be good at it!