"I need to get up and walk around and keep my knees from getting bad, which is what's happening"

Marian McPartland is highlighting the significance of physical activity in order to maintain healthy joints. She is suggesting that if she does not get up and move around, her knees will worsen. This is likely due to the fact that she is growing older and her joints are not as strong as they used to be. By getting up and walking around, she is able to keep her joints healthy and avoid them from deteriorating. This is a pointer to everyone that exercise is essential for keeping healthy joints and preventing joint pain. It is necessary to stay active and keep our joints healthy, no matter our age.