STRONG before Big: Strength Development for Youth Athletes

Every month a parent asks me the same question: “Won’t lifting stunt my kid’s growth?” It won’t, and this guide shows you why, with the research behind every answer.
Most youth strength programs either scare parents off or hand them an adult plan with lighter weights. This guide does neither. It sorts kids by how far through their growth they are, not by their birthday, because two 12-year-olds can be years apart in how physically mature they are. Then it gives you a 12-week plan that fits each child, with a gym and a no-gym version of every exercise.

Where the evidence is strong, I say so. Where it’s an association and not proof, I say that too. Where something is my coaching approach and not a study, I label it as mine.

Part One: The Why
Won’t it stunt his growth? Where the growth-plate fear came from, what the American Academy of Pediatrics, the International Consensus and the NSCA say now, and the one real risk parents should know about.
The myths that won’t go away. Six common myths, from “wait until 12” to “it makes girls bulky,” and what the research actually shows.
What strong kids get. Better movement skills, more spring and quickness, fewer injuries, and strength that tends to last into adulthood. Including a trial of almost 4,000 young soccer players where a strength and landing warm-up cut injuries by 48%.
Too fast for how strong they are. Why speed and skill can outgrow the body, what early specialization does to injury risk, and three simple warning signs to watch.
Birthdays lie. The three growth stages, how to track growth at home with a wall and a pencil, and what to change during a fast growth phase.
The long game. The long-term athletic development models explained in plain language, including the Youth Physical Development Model charts for girls and boys.
Pain is the line. How to tell effort, soreness and pain apart, and why painful movements get treated, not trained.
What good coaching looks like. What to look for, my rules for lifting, and five questions to ask any gym or coach.

Part Two: The Program
Find your level. Beginner, Intermediate or Advanced, set by months of lifting plus six simple readiness tests, each scored pass or not yet.
12 weeks in four phases. Learn It, Own It, Fast, Show It. Three weeks each, with a challenge week to finish every phase.
Two lifting days and a play day. About 50 to 55 minutes a session, with an optional third day for kids past the growth spurt. Every session ends with a game.
Stage rules. How to adjust the plan before, during and after the growth spurt, plus a five-minute home mobility routine for kids who are growing fast.
Effort you can explain to a kid. Stop with two or three good reps left in the tank, and add weight only when every rep looks the same.
Real life built in. Growth-week swaps for sore knees and heels, an in-season plan, an equipment list and a swap list.
 
Inside the guide
A gym and a no-gym version of every exercise
A one-page chart of the 12 weeks
A play menu of 12 games
Printable logs for height, readiness tests, the week 12 challenge and training days
25 references to published research
 
Who it’s for
Parents and coaches of kids aged 8 to 16 who want to start strength training safely, at home or in a gym. It works for a 9-year-old who has never lifted and a 15-year-old with a year of training. Pair it with Built to Fly, my speed guide, for the sprinting side.
 
For education only. Not medical advice. If your child has an injury, pain, or a medical condition, check with their doctor or a qualified practitioner before starting.