For the first step you need to breath both in and out in at a steady pace

Then you must learn how to walk one foot at a time.

Now you must walk in on a friend or loved ones corpse soon after they have been murdered, once you find them drop to your hands and knees and scream until your vocal chords bleed and your lungs collapse.

I hope this helps in life, soon you'll find yourself doing this for even the smallest things.