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Some children have difficulty learning their left side from their right side. Although the English language is read from left to right, many children don't realize it. They just follow what they have seen their parents do. We are focusing on the left, since it has a natural marker in the left hand that we are about to show you.
In order for your child to understand this trick, she has to know the direction of the capital letter "L".

Sorry this trick will only work for people who are right handed.

"Simon Says"
Play "Simon Says" with directions of putting her left hand on her head or hop on her left foot.
Focus on doing a variety of things with the left side until she knows it automatically before incorporating the right side.
Check out this youtube video to see how's it's played:
Disney Channel Games - Simon Says #2 (podcast)
"Hokey Pokey"
Play the classic "Hokey Pokey" and dance together through the house to practice her left and rights in a fun way.
Here are two youtube videos that may help you remember the song.
Pillow Heads Dance the Hokey Pokey
HAPPY DVD 2 - Hokey Pokey