Answer:
really nothing we dont do that anymore
Explanation:
It is D a professional health but that reliable B the internet that has the most infomation
We get in shape, keep a set goal, motivation, blood flow, makes your mental better
The answer is : increased resistance need to be added to the muscles.
Muscle conditioning refer to muscle strength and endurance. In order to improve it, you need to put your muscle in a harsher condition in a harsher condition than it used to be, so your muscle could adjust to it. That's why you should keep increasing the resistance