Describe the continuous nature of the physical fitness concept.

physical fitness is the ability of an individual to perform day to day tasks without being tired  

Explanation:

They don't get tired easily and have the ability and muscular strength to do daily activities  

one day because their over eating or whenever it kicks in their body

out of the choices i'd say d the ability to set goals, mainly because to desire to continue you need motivation but it isn't motivation in that part, but setting goals means you have an endgame and you want to reach it which sums up motivation.