Based on David's Student Story,which is about cardiorespiratory fitness,he is having trouble when he runs because he has

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David's difficulty when running is likely due to not having adequately trained his cardiorespiratory system. This is supported by his statement that he "can barely make it two blocks without feeling winded." If he had a previous injury or had not been physically active for several years, it would likely be more difficult for him to exercise in general, not just specifically when running. Not doing enough repetitions when lifting weights would primarily impact muscle strength, not cardiorespiratory fitness.

Based on David's Student Story,which Is About Cardiorespiratory Fitness,he Is