Final answer:
Mary's online petition for an exercise park addresses the physical environment health determinant by providing accessible outdoor exercise options to improve community health and resilience.
Step-by-step explanation:
Mary's initiative to convert an undeveloped parcel of land into an exercise park is a solution to overcome the health determinant of physical environment. Her actions address the lack of local opportunities for physical activity, which can significantly influence health outcomes.
By promoting the creation of a space dedicated to outdoor exercise, Mary is working to improve the community health by offering accessible exercise options which have been shown to reduce obesity, foster psychological well-being, and increase community resilience. Environments like the proposed exercise park encourage physical activity, supporting cardiovascular fitness and combating sedentary lifestyles that contribute to health issues such as obesity.