‘Exercise is good for the body, mind and soul.’ Write the text of a speech to be delivered at your school or college in which you persuade young people to do more exercise.

From building intelligence to strengthening memory, exercise boosts brainpower in a number of ways. Studies on mice and humans indicate that cardiovascular exercise creates new brain cells—a process called neurogenesis—and improve overall brain performance. It also prevents cognitive decline and memory loss by strengthening the hippocampus, the part of the brain responsible for memory and learning. Studies also prove that physical activity boosts creativity and mental energy. So if you’re in need of inspiration, your big idea could be just a walk or jog awayExercise improves mental health by reducing anxiety, depression, and negative mood and by improving self-esteem and cognitive function. Exercise has also been found to alleviate symptoms such as low self-esteem and social withdrawal.

Explanation:

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the pronoun reference replaces a noun, but you have to make sure there's no room for confusion.

in the first sentence "her" could be referring to shely or to the sister. the answer there is "shelly called her sister and told her about the new baby."

in the second sentence "it" could be referring to the roof or the floor. the answer there is "since the roof leaks on the family room floor, we need to repair the roof."