Participants assigned to this arm will receive a Group Laughie intervention delivered by a trained nurse and certified laughter yoga instructor. The intervention consists of virtual group sessions conducted via an online platform (e.g., Zoom). Participants will attend one session per day for 14 days, during which they will engage in 1 minute of intentional group laughter to create a Group Laughie. Each session will be recorded, and the recording will be shared with participants. Participants will be instructed to engage in additional laughter practice using the Group Laughie recording twice daily, resulting in a total of approximately 3 minutes of intentional laughter per day. Participants will be encouraged to laugh naturally and voluntarily, either individually or with others, and may focus on personal motivations such as enhancing well-being or positive affect.

The intervention is a group-based Laughie (Laugh Intentionally Everyday) prescription delivered over 14 consecutive days. Laughie is a structured well-being approach that incorporates intentional smiling and laughter exercises. The intervention will be delivered through daily virtual group sessions conducted via an online platform (e.g., Zoom). During each session, participants will engage in approximately 1 minute of guided intentional laughter in a group setting. Each session will be recorded, and participants will be provided access to the Group Laughie recording. Participants will be instructed to engage in additional laughter practice using the recording twice daily, resulting in approximately 3 minutes of intentional laughter per day. The group-based format is designed to support participant engagement and social interaction during the intervention period.

Following the Group Laughie participants noted whether they enjoyed it, and whether they laughed for the full minute, or at least for 30 s. Participants were prescribed to laugh with their Group Laughie twice a day. Similarly, and in addition, participants noted if they enjoyed laughing with the Group Laughie and whether they laughed for the full minute, or at least 30 s, after each time. This resulted in data from 840 Laughie experiences (3 × 14 × 20). This data is briefly summarized in the Results section

Following the Group Laughie participants noted whether they enjoyed it, and whether they laughed for the full minute, or at least for 30 s. Participants were prescribed to laugh with their Group Laughie twice a day. Similarly, and in addition, participants noted if they enjoyed laughing with the Group Laughie and whether they laughed for the full minute, or at least 30 s, after each time. This resulted in data from 840 Laughie experiences (3 × 14 × 20). This data is briefly summarized in the Results section.

The Laughie Experience Questionnaire is a post-intervention questionnaire designed to assess participant experience and intervention acceptability. The questionnaire includes items evaluating enjoyment and perceived experience of the 14-day Laughie prescription and daily group sessions. Participants will respond to statements (e.g., enjoyment of the intervention and group sessions) using a 5-point Likert scale ranging from "strongly agree" to "strongly disagree." The measure is adapted for use in this study based on previously developed Laughie-related questionnaires.

The PIPIM is a new descriptive generic post-intervention descriptive measure designed to draw out intervention perceived impact (IPI) by aligning all questions to the intervention being used. Here, the PIPIM used was an adapted version of the PPOP (Positive Psychology One-off Post-intervention measure) conceived by one of the authors and first applied in citizen science research. The PPOP consists of 20 questions including "Do you feel more happy and cheerful after using the Laughie for 14 days" and "Do you have more energy after using the Laughie for 14 days". PIPIMs use an 11-point Likert scale (0 to 10): "A great deal less; A lot less; A fair bit less; A little less; A tiny bit less; The same; A tiny bit more; A little more; A fair bit more; A lot more; A great deal more"