In aqua aerobics, how can physical activity reduce the risk of fractures?

The choice promoting bone formation as the answer is correct because engaging in physical activity, such as aqua aerobics, stimulates bone density and strength. Weight-bearing exercises, or resistance exercises, lead to the activation of bone-forming cells called osteoblasts, resulting in the increased mineralization of bones and a reduction in the risk of fractures.

In the context of aqua aerobics, the resistance of water while exercising helps to strengthen the muscles that support the skeletal system, which not only assists in improved balance and coordination but also contributes to a stronger bone matrix. This ultimately reduces the likelihood of fractures, particularly among populations at higher risk, such as older adults.

Other options, while associated with benefits of physical activity, do not directly address the question of fracture risk in the same manner. For instance, increasing joint flexibility is advantageous for mobility and can enhance the range of motion but does not specifically contribute to the enhancement of bone density. Engaging in high-impact activities can indeed promote bone strength as well, but aqua aerobics is more gentle and often safer for those prone to fractures, making this option less relevant. Lastly, avoiding movement entirely would lead to weakened bones and increased risk, which contradicts the goal of fracture prevention.