2) Provide opportunities for one hand stabilizing while the other hand manipulates, such as mixing bowl activities with real food or sand and water. Practice tearing or folding paper during craft projects. Let your child open and close lids of jars. Hammering toys. Practice beading. Using a pipe cleaneris easier than string.
3) Encourage galloping and one foot hopping, alternating left and right foot. When child is able, encourage skipping, riding trikes, wheelbarrow walk, crawling under and over things, scooter board games.
4) Ball play: Toss a large or medium sized beach ball (or easy to catch ball) from a short distance. Use a smaller ball as skill develops and step farther away. Have the child hold a baseball bat, broomstick, cardboard tube and practice hitting a big ball. Swinging will encourage arms to cross the midline.
See also the following resources: