I think you will be hard pressed to find a town with excellent schools in lower Westchester where the football players and cheerleaders "rule" the school. More emphasis is placed on academics. I know Irvington has an excellent track and field team- as well as a very good bowling team
I think you may find more emphasis on football, sports in Northern Westchester, but not too sure??? Dobbs Ferry has a state championship football team- so I think sports, ie- football, baseball, might be a bit "bigger" there- but doubtful it dominates the social scene for the kids. Definitely not an issue.