There are many ways to define physical fitness.
I like this one the best:
Optimum physical fitness is the condition resulting from lifestyle, that leads to the development of an optimal level of cardiovascular endurance, muscular strength, muscular endurance and flexibility, as well as the achievement and maintenance of ideal body weight.
Cardiovascular endurance,
also referred to as aerobic fitness, describes the ability of the cardiovascular/cardiopulmonary system (heart, lungs, blood vessels) to deliver an adequate supply of oxygen to exercising muscles.
Muscular strength,
is the maximum amount of force a muscle or muscle group can develop during a single contraction.
Muscle endurance,
is the number of repeated contractions a muscle or muscle group can perform against resistance without fatiguing, or the length of time a contraction can be held without fatigue.
Flexibility,
describes the length of movement which can be accomplished at a joint, such as shoulder, knee, usually referred to as the “range of motion of a joint.”
Ideal body weight,
represents an ideal body composition:
- Body fat
- Lean body mass – represents all the body’s weight, excluding fat – muscles, bones, organs, and nervous tissue.
It is possible to measure one’s level of fitness in each of the areas of optimum fitness using a variety of fitness tests.
You can probably already tell, considering your lifestyle and nutrition if you are in optimal fitness.