The answer is D. letter A could increase the chance of injury, but not necessarily depending on other kinds of workouts available. Letter B is definitely not the answer because there can be many variations to make running a more enjoyable exercise. And C is not the answer because running is a great form of exercise for the body. the answer is D because cardio may increase the chances of leading to a heart attack.
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Answer:
"Why does sadness hurt my stomach?
The physical reason why emotions and stress can lead to stomachaches and other digestive problems is because the gut is highly sensitive and full of nerves, just like the brain. "There is definitely a connection between the brain and the gut," says Francisco J. "