Today,there are laughter clubs around the world.They try to improve people's health with laughter. The laughter clubs started in India.Now they are all around the world. There are more than 450 laughter clubs just in India.All kinds of people join a laughter club.They go once a day for 20 minutes and start to laugh.There are no jokes.People laugh as a kind of exercise,and everyone feels better afterwards.Some people pay a lot of money to money to join a laughter club just laugh.