Preschoolers are perpetual motion machines and can easily wear out their parents. Fresh air and exercise are essential. Head outside whenever possible. Ask your local civic association about area playgrounds, parks, beaches, public pools, nature centers, or any other outdoor activities.
In my opinion, children need plenty of unstructured, free play. Just set up a safe space with a few age-appropriate toys and let them tire themselves out! If they need help getting started, you will find excellent ideas for outdoor activities, like obstacle course, animal exercises, and more at Education.com:
http://www.education.com/activity/preschool/outdoor/
I am also a big fan of the book Unplugged Play, which has hundreds of activities that children can do together, with an adult, or solo, at every age.
Most towns also have a newspaper and/or website where you can find out about fairs, festivals, children's concerts, and other outdoor events and venues during the spring and summer.
As the weather turns cooler, your local library may offer music and movement classes for free. You may also find indoor playgrounds in your area. These charge admission, but often you will find discounts online.
If you find your children's energy level crosses from the usual preschool non-stop motion into overly rambunctious, your kids may actually be over-tired. Although it sounds counter-intuitive, manic and hyperactive may signal a need for more sleep. Make sure they are getting enough rest at night. Many preschoolers still need a nap but refuse to take one. Instead, try setting up a "quiet time" in the middle of the day before they get over-stimulated. Make a fort with sheets, bring in favorite blankets, pillows, and plush friends, and put on some soft music or read a calm book or two. This relaxing time may help your children re-charge and at the very least it will give you a well-deserved break!
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Candace Lindemann, Ed.M.
JustAsk Expert
http://CandaceLindemann.com