How can exercise potentially pose a risk to someone's health?

Exercise, while beneficial in many ways, can also pose certain health risks, particularly when performed excessively, without proper technique, or without adequate preparation. One significant concern is the potential for musculoskeletal injuries. These types of injuries can occur from various factors, such as improper form, overtraining, or engaging in activities that the body is not conditioned for. Common examples include strains, sprains, and stress fractures.

Furthermore, exercise can potentially lead to a cardiac event, especially in individuals with underlying heart conditions. During intense physical exertion, the heart rate increases, and blood pressure can rise, placing additional stress on the cardiovascular system. This can be particularly risky for those who have not been regularly active or who have pre-existing health issues, as the sudden demands placed on the heart may lead to serious complications.

The other options, while related to physical fitness, do not accurately capture the risks associated with exercise as directly as the correct choice. For instance, exercise typically enhances cardiovascular fitness and body strength rather than decrease them, and dehydration and fatigue are concerns but are generally secondary effects of overexertion rather than immediate risks of exercise itself. Thus, the most direct and evident risks associated with exercise arise from the potential for injuries and serious cardiovascular events, making