Eligibility Criteria:
Inclusion Criteria:
* Those who can speak and understand Turkish,
* Those who agreed to participate in the study,
* Adult age group between 18 and 60 years old,
* Those with pain intensity \<2 according to the Visual Comparison Scale,
* Those with time and place orientation,
* Those without vision and hearing problems,
* Those who are literate or have literate relatives,
* Those without history of psychiatric illness,
* Those without any history of psychotropic drug use and history,
* Those without previous laughter yoga practice,
* Those with a smartphone/computer/tablet,
* Those who undergone laparoscopic sleeve gastrectomy surgery,
* Those who can attend the trainings at the specified times so that cortisol is not affected by circadian rhythm,
* Those who are able to comply with the collection of saliva samples,
* American Society of Anesthesiologist (ASA) score I, II or III as assessed by physicians
Exclusion Criteria:
* Those who speak Turkish but cannot understand,
* Those who are under 18 and over 60 years of age,
* Those who are not willing to participate in the study,
* Those diagnosed with psychiatric illness,
* Those with previous laughter yoga practice,
* Those with physical limitations/respiratory problems who cannot perform yoga movements,
* Those who have difficulty in doing breathing exercises due to deviated septum etc,
* Those who have undergone abdominal surgery in the last six months
* Hypothyroidism, hyperaldosteronism, pregnancy, malignancy, congestive heart failure, psychotic disorder, chronic liver failure, uncontrolled hypertension, glaucoma, herniation, nephrotic syndrome, type 2 diabetes mellitus, Patients with a diagnosis of chronic renal failure and continuous use of medication were excluded as salivary cortisol levels may be affected,
* Those with an ASA score of 4,
* Those who don't undergone laparoscopic sleeve gastrectomy surgery,