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.
Isokinetic exercise is a type of strength training. It uses specific exercise machines that produce a constant speed no matter how much effort you produce. You can not use them at home because machinery is involved to get this type of exercise.
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