Which is the strongest evidence to support the claim? One study showed that after an eight-week program of regular physical exercise, students' scores on math and English assessments rose. Researchers at the University of Texas have demonstrated that engaging in a regular program of physical exercise helps healthy adults to stay mentally sharp as they age. An analysis of more than twenty studies found that young people who engage in regular physical exercise are more likely to report high levels of self- confidence.

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Which is the strongest evidence to support the claim? One study showed that after an eight-week program of regular physical exercise, students' scores on math and English assessments rose. Researchers at the University of Texas have demonstrated that engaging in a regular program of physical exercise helps healthy adults to stay mentally sharp as they age. An analysis of more than twenty studies found that young people who engage in regular physical exercise are more likely to report high levels of self- confidence.

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The strongest evidence to support the claim would be the second option: "Researchers at the University of Texas have demonstrated that engaging in a regular program of physical exercise helps healthy adults to stay mentally sharp as they age." This evidence directly links regular physical exercise to improved cognitive function in healthy adults, which is a significant claim supported by research conducted at a reputable institution.

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