It is a little bit complicated, but what I do, I put some music on, I lay down on a bed or a sofa, with my head hanging from the edge, and hanging as much necessary, so as the prefrontal cortex is the lowest point of my whole body. That way blood starts to flow towards the lowest point, and the prefrontal cortex is responsible for imagination, memory, higher order ideas and more. I want to activate that particular area of the brain.

My hands, are at the back, and pressed by my body, one at the height of the scapulae, one lower. There is one muscle, that gets exercised, only when the hands are configured like that, at the back.

From then on, I move my mouth as if i am chewing imaginary leaves, like a cow. Breath synchronizes with the mouth moving, and the stomach is moving as if it is getting hit by a fist.

I get six pack at my belly, just from that exercise. The main reason I do that though, is that I want to pump as much blood to the prefrontal cortex as possible. I get some crazy ideas that way.