Today, a modern definition of being fit either means a person or machine's ability to do it's thing and to be able to cope with various situations.
I enjoy exercise, but I need to do more research about physical fitness. It is a state of well-being, health and the ability to perform sports, occupations and activities. Indeed. I used to run in college, but then I started having trouble with my knees. What else might I try? Well, what I can tell you is that Physical fitness can be achieved through proper nutrition, physical exercise and rest. So, it's a combination of those things and not just exercise Also, before the industrial revolution, the capacity to perform daily activities without undue fatigue was the definition of fitness. I guess so. Life was harder back then, especially if you spent all day working in the fields. However, nowadays, fitness is defined as the state or quality of being fit Ha! Well, all we can do is try. But it can't help us too much if it just leads to more anxiety.
Modern definition of fitness describe either a person or machine's ability to perform a specific function or a holistic definition of human adaptability to cope with various situations.