Walk, run, or take a bike ride. Summer is the perfect time to head outside. You can enjoy the great outdoors (and get in some cardio) while walking through your neighborhood or running around the block. If you have a bike and a helmet, consider taking a daily bike ride instead. Make sure the weather is not too hot. Generally, going outside is unsafe if it's over 100 degrees. Look online for a kid-friendly “30-Day” walking or running challenge. This will give you something to work towards every day!