A week's time is very short, and during this period, Xiang Yu had been discussing martial arts techniques with Hong Jinshuai, then pairing it with both of their practices.
In the beginning, Xiang Yu said he had a bit of a foundation; although Hong Jinshuai didn't say anything on the surface, he actually looked down on him in his heart, thinking, "Even if you have a foundation, it's impossible to learn anything in a week."
But since the other party had come to learn sincerely, he naturally couldn't refuse. However, after a week, his opinion of Xiang Yu had completely changed. Not only was Xiang Yu's punching and kicking skills outstanding, but his physical strength was unimaginable. Every time he sparred with Xiang Yu, Hong Jinshuai would feel waves of pain, while Xiang Yu remained unfazed, as if he didn't feel it at all.
In fact, what he didn't know was that Xiang Yu wasn't using his full strength; if he had, he probably could have broken Hong Jinshuai's leg with one kick.