In order to continue to improve muscle conditioning after muscle adaptation occurs, decreased resistance needs to be added to the muscles fewer sets should be performed a greater rest time should be used increased resistance needs to be added to the muscles

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

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