Josiah

wow...

1. cardiovascular- without it, we couldnt breathe...and then we couldnt run for extended periods of time. also, it keeps us alive...if we were dead we couldnt do anything physical...we would be dead.

muscular- it makes us move, and moving is physical activity. without it, we couldnt move, and we wouldnt be doing anything physical.

skeletal- again, it makes us move. also, it holds us together so we can do things. again, without it, we couldnt move, and we would be doing nothing physical.

2. cardiovascular- we need to exercise it. ie. running helps it because the heart pumps oxy to our bodies and if were running, it will be pumping extra hard, and doing things extra hard with your body usually works something out and exercises it.

muscular- again, we need to work them out, or warm them up before we use them. we can work them out by lifting weights. warming them up can look like stretching before running, playing a soccer game, or even going for a bike ride.

skeletal- DRINK MILK! calcium helps strengthen your bones.