As everyone gradually left, Kevin's life returned to its orderly state.
Based on the ideas that emerged during his collaboration with Qi Duo, combined with the knowledge he had acquired, he began working on new potions.
Kevin had many concepts in mind, but transforming these ideas into actual potions required a significant amount of time to carefully formulate the appropriate ingredients and dosages before they could be produced.
This was a gradual process that couldn't be rushed.
Moreover, this process allowed Kevin to understand each of his materials more deeply, knowing the characteristics of each one, so that he could produce the desired potions more quickly in the future.
In addition, Kevin continued his habit of eating large amounts of food and using potions to aid training to promote his own growth.
Facts proved that this path of growth was indeed feasible.
When Qi Duo came, Kevin specifically asked her to give him a full body check-up.
After all, he relied on [Digestion Potion] to rapidly digest and absorb energy, and then trained intensely.
In terms of sheer physical fitness, his growth rate was extremely fast.
Although previous self-examinations had not found any side effects, if there was any oversight, the consequences would be unimaginable.
Furthermore, this training method had been ongoing for more than half a year, so even if problems were deeply hidden, they should be showing by now.
Fortunately, after Qi Duo's meticulous examination, the conclusion was that no relevant hidden problems were found.
Kevin's physical fitness was incredibly healthy.
This meant that as long as his body could withstand it and he didn't force his body to overuse "potions", this training method was harmless.
At this stage, Kevin's physical fitness already allowed him to train in this way once every two days.
However, as time passed, the effect of this training method gradually weakened.
First, the energy that food could provide was limited; even if Kevin ate only high-calorie foods, there was an upper limit to his intake.
He couldn't really eat until his stomach burst, and while using the Digestion Potion, no matter how fast he ate, there was a limit.
This energy was digested, stored, and then used for intense training, but the training intensity also had a limit.
Because Kevin was training his physical body, not his Nen Ability, the energy provided by [Digestion Potion] was also digested by the physical body, not the Nen Ability.
Even if Kevin trained non-stop, he couldn't break through this limit.
Although his physical strength had not reached a perfect state, he seemed to be gradually approaching a limit, entering a bottleneck.
It was a purely physical bottleneck.
Regarding this situation, Bisky, who had considerable experience in training, revealed the essential reason behind it.
This made Kevin recall his conversation with Bisky a few days ago.
"The human body is not something that can grow indefinitely; otherwise, humans would no longer be human. Training can indeed improve a person's physique, but there is inevitably a limit.
"Moreover, although humans possess strong adaptability, this change in adaptability occurs on a time scale of thousands or tens of thousands of years.
"Although your intense physical enhancement with the aid of potions hasn't produced side effects, the inherent limits of the human body are difficult to easily break through."
In this world, people's physical fitness was much stronger than in the world Kevin came from, and they also possessed the special ability called Nen.
This greatly strengthened their upper limit.
But essentially, they were still humans, not monsters.
From Bisky's perspective, Kevin's current physical fitness was already close to a certain limit.
In terms of physical strength alone, Bisky was quite confident in her judgment.
After this, even if he continued to train, even with the aid of potions, the growth rate would gradually slow down until each step forward became extremely difficult.
Ultimately, he would reach a limit state where no matter how much he trained, his physical fitness could not improve.
This was the limit of the human body, the container itself.
At that time, Kevin asked, "So, is this limit impossible to break through? Has anyone reached such a boundary?"
As soon as the words left his mouth, Kevin felt he had asked a foolish question, because if no one had reached it, how could there be such inherited experience?
At that time, Bisky just quietly stared at Kevin, then pointed to herself.