It often amazes me that FITNESS is a multi-billion dollar industry... Yet a good, concise and universal definition of fitness is difficult to nail down.
Just ask anyone participating in a physical exercise program, and even someone in the fitness market for that matter, bam15 15 Weight loss to provide you with an obvious definition of health and fitness.
You'll most likely be met with the "deer found in the headlights" stare accompanied by absurd stammering.
If you do get a solution, it will most probably be slanted toward the particular abilities of the person asked.
For example...

A marathon runner is going to define fitness in terms of muscular and cardiorespiratory endurance... A power-lifter will define fitness in conditions of absolute strength... A bodybuilder is going to define fitness in terms of muscle size and definition... etc.
But the overwhelming majority of people taking part in a physical fitness routine aren't professional athletes concerned with the improvement of one physical ability.
So, basing the definition of yours of fitness on a single certain physical skill does not lead to a universal definition of health.