The idea that your mind can affect your body seems a little far fetched, but probably most of the people visiting this forum have some level of belief in this concept.
The idea that the body can have an impact on the mind appears to be accepted by fewer people than the above belief. Which is a little strange since the body to mind influences is quicker and stronger.
Next time you are tired and are walking stooped over, first check your mental attitude and your feelings. Then try walking upright and with energetic body movements. Now check your attitude and feelings.
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Now that's not saying that by doing the cross crawl and lazy 8 variations you'll be a better thinker, but there is a large area of study into what kinds of movements can influence mental processes.
My own experience is not a controlled study, so many things are being used at once. My children have only one shot at being a kid, so I balance time and effort with available resources and the kids happiness and overall development.
So I use Brain Gym, paraliminals, a variety of study approachs, good old family fun, and one on one bonding.
Poor kid has listen to my four elements of best studying speech, and balancing different parts of your life. I just hope that some of it helps in their future.