Which of the following can result from a decrease in muscle strength due to aging?

The correct answer highlights a significant consequence of decreased muscle strength associated with aging, which is the increased risk of falls and injuries. As individuals age, muscle fibers naturally decrease in size and number, leading to a decline in overall strength and stability. This reduction in strength can compromise a person's ability to maintain balance, respond to sudden changes in their environment, and support their body effectively during movement. Consequently, weaker muscles can make it difficult for older adults to control their movements, which heightens the likelihood of accidents such as falls. Such falls can lead to serious injuries, including fractures, which are particularly concerning in the elderly population.

In contrast, while increased flexibility and improved balance are generally considered beneficial outcomes of physical activity and certain types of exercise, they are not direct results of decreased muscle strength. Similarly, increased endurance tends to be associated with cardiovascular fitness rather than a decline in muscle strength. Therefore, although some individuals may engage in activities that can maintain or improve flexibility and balance despite aging, these benefits do not arise from the decline in muscle strength itself.