It takes several weeks for a new activity to improve someone's fitness. Thus, the correct option is D.
What is Fitness?
Fitness may be defined as a complete set of physical, mental, and psychological well-being of an individual.
When a new activity is implicated in someone's life, it will take some time in order to demonstrate its effect. The same principle is applicable to the field of fitness as well.
Any new activity takes a time of several weeks in order to improve the fitness level of someone who is considerably following the new activity consistently.
Therefore, it takes several weeks for a new activity to improve someone's fitness. Thus, the correct option is D.
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