The marketing version vs. the science version
If you've talked to any private coach in the last five years, you've heard some version of: "the earlier the better." That makes for great sales pitches and absolutely terrible long-term outcomes.
The actual sports-science consensus, summarized across the AAP (American Academy of Pediatrics), the NSCA (National Strength & Conditioning Association), and most large-scale longitudinal studies on youth athlete development: kids should NOT specialize in a single sport before age 12–13. Period.
That doesn't mean kids shouldn't train. It means they shouldn't be locked into one sport, one position, one set of movement patterns. The athletes who get to elite levels — and stay healthy doing it — almost always played multiple sports through middle school.
What "training" should actually look like before age 12
From age 5–8, the priority is fundamental movement: running, jumping, throwing, catching, balance, coordination. The technical term is physical literacy, and it's the foundation everything else gets built on.
From age 9–12, kids should be sampling 2–3 sports per year. Yes, even if they "love" one. Cross-training during these years builds athletic versatility, prevents overuse injuries, and — counterintuitively — produces better single-sport athletes by age 16 than early specialization does.
This is when small-group skill training shines. Not 4 hours a day of drill work, but 2–3 sessions a week of well-coached, age-appropriate progressions across whatever sports they're sampling.
After age 13: when specialization actually starts to matter
Around 13–14 is when kids can begin to specialize without significantly raising their injury risk. By high school, if your athlete is serious about a single sport — varsity track, scholarship track — yes, the volume and specificity of training should ramp up.
Even then, the best research suggests athletes still benefit from playing a secondary sport in the off-season. Multi-sport athletes get recruited at higher rates than single-sport athletes at almost every Division I program. Coaches know this. Parents often don't.
So what should you actually do?
If your kid is under 12: prioritize fun, fundamentals, and variety. Get them in 2–3 sports a year, work with coaches who understand age-appropriate progression, and ignore anyone telling you they need to specialize "now or never."
If they're 13–15: it's okay to start specializing if they're driving it. Pair it with off-season cross-training and watch for overuse signs (recurring soreness, declining motivation, sleep issues).
If they're 16+: full specialization is appropriate, but recovery, sleep, and load management become non-negotiable.
At Apex, every program is built around age-appropriate progression — we don't run the same drills for an 8-year-old that we run for a 16-year-old, and we won't pretend specialization at 9 is a good idea just because a parent's willing to pay for it.