This has been discussed on this board some. I know in my area in the public school system, they will not "hold you back" just for sports...you need to be failing. Therefore, your child would need to enroll in private school for a year to repeat a grade. If you are already in private school, they may allow you to regrade your child. Some families have a child repeat Kindergarden or an additional year of preschool, but most of those families are not thinking about playing time 10 years down the road and it is more to ready their child for elementary school. Another option is "the 13th year" of high school at some (military, other) academy, to allow for another year of physical maturity. A friend of mine's son did that for basketball and got picked up by the Naval Academy!