It always amazes me that FITNESS - http://www.automotivedigitalmarketing.com/main/search/search?q=FITNESS is a multi billion dollar industry... Yet a great, universal and concise definition of fitness is hard to nail down.
Simply ask anyone taking part in a physical exercise program, or even someone in the health industry for java burn complaints - check out this site - https://www.islandssounder.com/national-marketplace/java-burn-reviews-is... - that matter, to give you an apparent definition of fitness.
You will most likely be met with the "deer seen in the headlights" stare accompanied by nonsensical stammering.
If you get a remedy, it'll most probably be slanted toward the specific capabilities of the person asked.
For example...
A marathon runner is going to define fitness in conditions of muscular and cardiorespiratory endurance... A power-lifter - https://Openclipart.org/search/?query=power-lifter will define fitness in conditions of absolute strength... A bodybuilder is going to define fitness in terms of muscle size as well as definition... etc.
But the vast majority of people taking part in a physical fitness routine aren't professional athletes worried about the improvement of only one physical ability.
So, basing the definition of yours of fitness on one certain physical ability doesn't lead to a universal definition of health and fitness.