5 Simple Guidelines: how to enjoy yourself

Wear loose and comfortable clothing. Trousers should be tied below the navel and should not obstruct the abdominal movements. Try and avoid tight belts that restrict belly movement.

Relax your jaws and open your mouth a bit wider to enable laughter from the belly. If your mouth is tightly closed, laughter will come from the throat or the upper chest.

We invite you to alternate periods of laughter with relaxed breathing exercises eyes opened or closed, e.g. 2 minutes of laughter, 1 minute of breathing, etc.

You choose your when, where and how long. Start with 10 minutes and gradually increase the duration. Do this in a private space where you won’t be disturbed. If there are people around you, you can laugh without making sounds. A mornings practice is best as it allows you to start your day with a cheerful mood and good feelings, and a practice at any time is better than no practice at all.

source:  http://www.laughteryogaamerica.com/learn/laughteryoga-learn/add-laughter-life-laugh-782.php