But this statement is not unreasonable.

Human muscles are divided into fast muscle fibers and slow muscle fibers. Fast muscle fiber is strong and thick, but it is easy to get tired, while slow muscle fiber is weak in explosive force, but it has great endurance.

Look at the photos and you will know the difference between the Olympic 100-meter champion and the marathon champion. The black 100-meter champion is like a bodybuilder, but the marathon champion is a thin man with thin arms and legs. You will never see the devil muscle man win the marathon, nor will you see the small hemp pole win the 100-meter championship, because their muscle types are different.

People's muscle types are naturally related to genes, but the acquired exercise patterns will also be adjusted. Therefore, if a person always jogs for a long time, he will gradually lose weight and lose some explosive power. If a person always does explosive sports, his muscles will thicken. But these are all adjustments made under their own physical conditions.

In fact, it is not "lean muscle", but the development of fast muscle fiber to slow muscle fiber.

Therefore, this statement makes sense. But it is not mechanically understood as "40 points". Everyone has different conditions and cannot judge mechanically.