At 9 and 10, serving is the skill that decides entire matches (whole youth sets are runs of serves), and the honest goal is a RELIABLE underhand serve: same stance, same swing, same contact, over the net at a rate the kid can be proud of. Overhand can wait; an underhand serve that lands nine of ten is worth more than an overhand that lands three, in games and in confidence.
This session runs about 45 minutes with a lightweight or volley-lite ball (regulation leather stings young forearms and wrists) and any net substitute: a real net, a rope between chairs, a fence line. Distances start SHORT of regulation and grow only with success, because the swing built at a makeable distance is the same swing that reaches the real line by season's end.
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.
Underhand, proudly, until it lands nine of ten. Youth sets are decided by serve runs, and a reliable underhand wins them while a wild overhand donates them. The overhand gets built properly at 11 and 12; nothing about a great underhand delays it, and the confidence transfers.
A volleyball-lite or oversized trainer: lighter and softer than regulation, so serving and passing volume does not sting small forearms into flinching. Most youth leagues use them through 10 or 12. Regulation leather joins as the league requires it.
Many youth leagues literally allow it (a marked youth line or a step-in rule), and in practice the ladder IS the method: serve from where nine of ten lands, and let success walk the line back. A full-distance flail teaches flailing; an earned distance teaches serving.