There is a massive misunderstanding in the fitness industry regarding this topic.
There has been a tremendous amount of research showing unhealthy people are still fit, and fit people are still unhealthy.
The first step to understanding this statement is to fully understand the terminology.
When people think of being "FIT" they think of being healthy. This is not necessarily the case. Fitness is only one piece of health.
Fitness is actually defined by 5 components: Body mass, muscular strength, muscular endurance, cardiorespiratory endurance and flexibility. I feel "Recovery" should be added as another.
Anyways, there are many "FIT" people out there, but they have no idea what is going on underneath. They could have high blood pressure, high cholesterol, high blood sugar, etc. These conditions allow you to still exercise at a high capacity, usually without feeling any symptoms.
Have you ever heard of a marathon runner finishing the race and collapsing from a heart attack? Chances are it was an electrolyte imbalance or congenital heart disease, but it could also mean they have arterial disease.
To conclude a very important topic:
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