RecruitingBehavioural interventionSauna for Offline Connections and Interactive, Authentic LivingThis pilot trial will test an intervention (sauna visits) targeting reductions in loneliness in adults aged 19-22 years. Participants will: * Visit a sauna in San Francisco once per week for 2 hours by themselves or with a friend, for 8 weeks total * Complete online surveys throughout their participation The main question this pilot trial aims to answer are: * To what extent do participants find the study design acceptable? * To what extent do participants complete the weekly sauna visits? * To what extent do participants complete the weekly online surveys?