Describe the continuous nature of the physical fitness concept.

Physical fitness is continuous in nature because you need to constantly work towards it and improve it.

Explanation:  

Physical fitness is something that requires regularity and determination. You cannot overlook this once you achieve your goal; rather you need to do it every day. Physical fitness is the sum of all the choices you make concerning your lifestyle. Things like, what you eat, the amount of time you work, exercise and other factors like stress, lack of sleep etc. affect your physical fitness.

i believe the answer would be 'd'.

hope this !