I think the answer is that they PUT IT OFF ON SOMEONE ELSE. im not sure though, do u have any answer choices? let me know if its right or not! :)
Answer:
Overload: A principle of exercise that states that the only way to improve fitness is to increase over time. This can mean increasing the amount of resistance, increasing the amount of time, or increasing the speed. When just beginning an exercise, it is generally difficult
Answer:
A and C are both long term challenges, I'm pretty sure it's A.
Explanation:
Personal experience, I have arthritis and it's a long term challenge.