The end of summer break means your kids' energy levels might hit an all-time low, especially with the adjustment of heading back to school and lack of free time due to extra-curricular activities, homework, etc. One of the best things you can do is whip up some healthy smoothies for them that are chock-full of essential vitamins. This will help keep their energy levels up and allow them to concentrate better. Opt for seasonal fruits, and add a touch of citrus flavor for extra zing.