Okay wierd question!

How do each of these perform in Physical Activities?
Your Cardiovascular System pumps the blood through your body so as you speed up when running your heart rate is faster and there for you loose more wait and get more fit.
Your Muscular System is what makes you move if you did not have the muscle system to move your muscles than you would not be able to move and if you cant move than... no physical activity at all... PERIOD!
The Skeletal System is what holds your body together protects it and makes it so that you are not a pile of mush on the ground.
I am very glad to have my skeleton cause otherwise i would be a pile of flesh on the ground!
when you get hit by a ball you do not collapse on the ground... i hope. Your skeleton acts like sport gear like a helmet, knee pads and others it protects what is inside.