Which one of the following choices best represents an advantage of cardiorespiratory fitness?
a. decrease in bone mass
b. decrease in fat stores
c. decrease in muscle mass
d. decrease in oxygen intake

Correct answer choice is:

B. Decrease in fat stores

Explanation:

When you start your exercise, your body principally uses strength from glycogen reserves. After approximately 20 minutes, it begins to exert more reserved fat than glycogen. Consequently, you'll typically consume the utmost fat throughout cardio sessions that serve longer than 20 minutes.

d would be your answer