At 9 and 10, the windmill gets built from its pieces: the wrist SNAP (the little engine at the bottom of everything), the K position (the checkpoint where the arm is up and the body is sideways), and a full circle that stays loose and brushes the hip on the way through. Speed is nowhere on the syllabus; a loose, repeatable circle that throws strikes is the entire ambition, and it is plenty.
This session runs about 45 minutes with maybe 30 to 40 full pitches at effort inside it, the rest being snaps and pieces that cost the arm almost nothing. A parent with a glove on a bucket is a fine catcher; a marked square on a fence works too. The windmill is friendlier to arms than overhand pitching, but "friendlier" is not "free": effort ramps, honest volume, and pain-means-stop apply here like everywhere.
This plan was written for every 9 and 10 year old. ParentEdge writes one for yours.
Built around their game, their goals, and what they’re working on.
It is meaningfully friendlier than overhand pitching (the underhand release works with the shoulder rather than against it), which is why softball pitchers can throw more often. Friendlier is not free: effort ramps, counted volumes, rest days, and pain-means-stop still apply. Overuse is the enemy in every throwing sport.
In a practice like this, 30 to 40 full pitches at effort wrapped in low-cost snap and piece work, two or three sessions a week at most, with game days counted in the same ledger. The habit being built is the counting itself; the specific number matters less than someone honestly keeping it.
If she loves it, a few sessions with a windmill instructor to set the circle and snap correctly is genuinely valuable (the motion is specialized, and bad early habits are sticky). This plan is designed to practice BETWEEN lessons or before them: snaps, K holds, and counted strike rounds are exactly the homework instructors assign.