Time was not a factor in Jin's plane of subconsciousness as Ming and the White Tiger alternated training Jin in his inelegant swordplay. At first, he was embarrassed trying to behave clunkily, but that made him suffer even more wounds from Ming.
Only after he started to grasp the movements did Ming decide to take a break and let the White Tiger train with him. Unlike humans, the White Tiger was able to 'play' with Jin using grapples, knockdowns and tussles which made it harder for Jin to execute his fakeout attacks and he had to be more creative in actively avoiding them while performing the clumsy rolls.
What Ming had told him turned out to be true. Zeru's teaching about posture made it all the harder for him to forget since it was trained deep into his muscle memory. Thus, to speed Jin's learning process, Ming had secretly manipulated the plane to put in stones and sticks within the snow.
