Training stages follow growth, not team age, so they differ from the coaching age groups.
Answer two quick questions. This shows you what good, safe training looks like at your player's stage, and what to avoid. It is a guide for understanding, not a workout prescription.
Under 6? This guide starts at 6. Before that, the job is free play and lots of it.
Educational only. Not medical advice. This tool explains what is generally appropriate at each stage of development. It does not create a personalized program and does not replace a qualified coach, athletic trainer, or doctor who can see your athlete. If your athlete is in pain or in a growth spurt, check with a professional before training. Stage names come from the Sport for Life LTAD framework, a consensus model, not tested science. Reasoning and sources: The Development Guide.