He claims it's tested. Seems improbable though. It would be worth hearing the details.

My trainer use that method for more than 50 years: he started at 18 years in 1958. ;-)

Rules are simple: pay $1 and throw ball to basketball basket 6 times. 5-6 hits - $10-$20 worth ball, 4-3 hits - 10c worth prise, 1-2 hits - a sweet.

He started with single ball.