Another thing to put into your Homeschool Curriculum--or not feel guilty for including

http://www.nytimes.com/2009/02/24/health/24well.html?_r=4&emc=eta1

Kids need play time--especially outside in a natural setting (like a yard).

So don't feel guilty if you miss a few "lessons" because the kids are busy playing outside.  It's actually one more reason to homeschool--so kids can escape outside when they need to, instead of when the clock says to.