My oldest turns 12 in May, and he's played baseball and football since he was 5. Last fall he did cross country for the first time, and really enjoyed it. He's also going to do middle school track this spring (doubling up with baseball). The best suggestion I have is to not specialize in one one sport. I live in big hockey country in northern Wisconsin, and so many of the kids my son's age (and younger) play hockey year-round. Many more play soccer year-round. I never understood the concept of specializing, unless your goal is to burn your kid out on the sport by the time they reach middle school. Perhaps there are a few kids out there who truly love their chosen sport, but for the most part, there is likely a 99.99999% chance that your kid is not going pro in that sport, so let them diversify, and let them be a kid!