When the body is in unrest, the mind is in unrest
When the mind is at rest, the body can rest
When the body is at rest, the mind can rest
How wonderful this connection between body and mind
No wonder that so many practices focus on the breath. The key to unlock the connection between body and mind.
As Thich Nhat Hahn teaches in this practice (in your thought say the words on in-breath and out- breath)