A certain person once said," No matter where I put my mind, my intentions are held in check in the place where my mind goes, and I lose to my opponent. Because of that, I place my mind just below my navel and do not let it wander. Thus am I able to change according to the actions of my opponent."
This is reasonable. But viewed from the highest standpoint of Buddhism, this is a low level of understanding. It is at a level of discipline and training. It is at the level of seriousness.
You will have no ability to move ahead and will be un-free.
In what part of my body than should I put my mind?
If you put it in your right hand, it will be taken by the right hand and your body will lack its functioning.
If you put it in the eye it will be taken by the eye, and the body will lack its functioning.
No matter where you put it, if you put the mind in one place, the rest of your body will lack its functioning.