Answer:
to reduce the repetitions
Explanation:
If Carlos wants to develop strength, he needs to use high resistance, like in this example, 85 % of his maximum strength level, but with few repetitions, in this case, that he wants to make 15, he needs to reduce this number.
In the other hand, if he wants to increase the muscular endurance, he needs to use low resistance and increase a lot the number of repetitions.
Remember the continuum is the relationship among repetitions and resistance that a person need to build muscle fitness.
Hope it was useful this info.