"For instance, the chubby boy from the Cen Family Village last time, even though his physical body was strong, he still couldn't practice it. The two cultivation techniques within would only cause severe conflict, at best backfire on oneself, and at worst cause the body to explode and die."
"Now do you know why there are fewer than a handful of people in the entire Cultivation World who can master this cultivation technique?"
A sudden enlightenment.
Just hearing the first two matters, although there are thresholds, the threshold is not considered too harsh, because many of the opportunities for body cultivation are due to having a relatively good physique and quite a good chance. The harshest estimate is to endure a force twice as strong as one's cultivation base.