"When a normal person is under normal stress, the heart opens and closes at a regular pace, but when the stress becomes too great, every part of the body requires more... um, strength, let's call it strength. This is when the heart needs more and faster blood to provide energy, so the heart behaves like this..."
Manbao sped up the opening and closing motion, saying to the three who were listening attentively, "Generally, when we lift heavy objects or use our brains strenuously, there's a limit. Twelve hours a day, you can't always be bending over a desk using your brain or doing hard labor. So it has ebb and flow, even if it temporarily exceeds its limit, it can handle it."
