Answer:
Jackie may maintain healthy body fat levels.
Step-by-step explanation:
The daily activities that Jackie is performing as well as the time that she spents doing exercise can help regulate her body fat levels, and help her maintain them in a healthy place for her, a digital timer can help Jackie use technology to asses her speed, and a risk that is not controllable and that may affect physical activity throughout a persons life would be family history, since the person can not control her DNA inheritance.