Steady, regular training does far more good in skill acquisition than occasional intense sessions. Sporadic practice often does no good at all in acquisition - though it can be enough to maintain skills that you rarely use, but don't want to lose.
Systematic and progressive training is the only way to safely achieve heavy physical training. Spradic heavy physical training can actually cause injury. Plateaus in physical training are often caused by trying too much too quickly, that is, by overtraining, heavy training with inadequate recovery cycles.
For either skill training or physical training, keep to a regular schedule of steady practice - without rushing or becoming impatient, or losing motivation.