Six months ago, Deirdre decided to get fit by taking up running. Three mornings a week, she runs for a half hour around the track at her school. Over time, she began to get more rest at night. This has given her more energy during the day, which has allowed her to make time for extra-credit projects in two of her classes.How has physical activity helped to bring about this change in academic performance?
Answer
A
by building motor skills
B
by releasing endorphins
C
by developing new brain cells
D
by making the body tired at night
Explanation
Running regularly can make Deirdre’s body tired at night, helping her sleep and get more rest. With more energy during the day, she has been able to spend time on extra-credit projects. So the best answer is “by making the body tired at night.”
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