Question

cardio is effective at
a) improving your energy levels.
b) decreasing your cognitive functioning.
c) reducing blood flow.
d) increasing your body fat percentage.

Explanation:

Cardio exercises enhance blood flow and oxygen delivery, boosting energy. They improve cognitive function (contrary to B), increase blood flow (not reduce as in C), and help reduce body - fat percentage (opposite of D). So, A is correct.

Answer:

A. improving your energy levels.