Wu Jian had spent several days inside of that cave. His newfound strength had been far too much for a single day’s worth of effort.
He spent the entire first day in meditation, which was essential for harmonizing his chi and achieving balance. By meditating for a prolonged period of time, he was able to calm his mind, release his inner tension, and regulate the flow of chi through his meridians. It was harder than it sounded. Meditating was far more than just sitting on his butt and keeping his eyes closed.