The exhale longer than the inhale.
Feel gravity: let your weight drop into your feet or the seat. Feel your weight being held by the seat or the ground.
Breathe in through the nose for 4.
Breathe out slowly for 6, as if gently blowing out a candle; at the end, draw the belly in.
Repeat calmly. If you feel dizzy, return to your natural breath.
Notice how your body is now.