Increasing the physical demands on the body over time to improve abilities is known as

Increasing the physical demands on the body over time to improve abilities is known as "progressive overload". Progressive overload implies that you are persistently expanding the demands on your muscles so as to make gains in their quality, size and perseverance.

Explanation:

answer; i believe that the correct answer is (75 to 84 years of age)

answer; i believe that the correct answer is (b) communication skills);