it'll have more training effect if you specify before going to sleep. Choose Training-All Throws, they'll all raise a small amount each night of sleep, or specific moves if you'd like. If nothing specified at all, every single move raises a tiny amount, I believe. And i mean very tiny amount. Shenmue ch1 is a real grind with training; Shen2 made it a bit easier to progress the move's bar, then Shen3 is easiest by far.