Most players plateau because a fundamental went uncorrected early — a panhandle grip, a flat-footed base, a smash powered by the shoulder instead of the forearm. Those habits get harder to unpick every year they survive.
So the first blocks of the junior pathway are almost entirely grip, footwork and stroke shape, before anyone is allowed to chase power. It looks slower for three months. It compounds for a decade.
Beyond that: small groups so every player gets corrected in every session, a written plan so progress is visible rather than vibes-based, and conditioning treated as part of the sport rather than an optional extra.
You'll also get an honest read at the trial. If a player isn't ready for a programme, or would be better served elsewhere, David will say so rather than take the fee.