Specializing in one sport may not be a helpful strategy for young athletes.

According to Tracking Football, a web-based service that creates profiles for high school athletes and follows their progress, nearly 90 percent of the players drafted in 2015 were once multi-sport athletes.

Jameis Winston continued to play baseball while at Florida State.

A 2014 advice column on the website of USA Football, the official youth football arm of the NFL, offers this: "The opportunity for your kids to play spring football or year-round football can be a good thing. It's completely up to you. But if you don't manage it or monitor their health it can be a bad thing."