Do you focus your mind on what you are doing, or do you do one thing, but think about something else at the same time? Do you work, eat, dress up or do anything else, but daydream while doing so? Do you align your thoughts with your actions, or are they two separate act
Do you hold your breath while concentrating intently on something? Many do so, as if holding the breath helps to concentrate. This of course is done unconsciously, but it causes physical and mental strain, which is absolutely not healthy and disturbs the concentration.