That is an interesting statement. My response to that would be that I think it might make more sense to me to replace the word “activity” with the word “fitness.”
While there is a course of development in life that offers the opportunity to be active, the responsibility is thrust upon us by the demands of life. The statement is true in that physical activity takes practice. Every step we take is a step closer to the last step we’ll ever take. It makes sense to take our steps correctly; meaning that the physical skills we learn are only skills if they assist us in prolonging life in the sense of both quality and quantity. Going off of that, “physical fitness” makes more sense in the sentence than “physical activity” does, in my opinion.
I like that quotation.