This next drill requires you to be aware of your pulse in at least one place (better if you can feel it at the heart and the hands and so forth) Be still while you lie down, stand motionless or hang from a tree branch. Now with sufficient air in you stop breathing and become aware of the pulse. Try to feel it in the limbs (hand fingers and ankles) than at the arm pits and inner thighs and so on. Once the entire body is pulsing (reminder it already is :)) Try to keep the pulse at an even level even if you are holding your breath (prolonging the pause phase sounds less intimidating and the mind plays a roll here as in everything) And go the distance. Relax the body from within as the pelvic floor aligns and you become aware of the support the ground gives throughout. If you are able to count 30 heart beats than try to play with it by slowing down and speeding at will. Many things may happen here. You might start to sweat, feel a burning at the throat and so on. Accept them and be glad you are alive.