The aim of the present study was to investigate whether dispositional mindfulness moderates the relationship between self-determined motivation and exercise amount. The current study consisted of a Swedish population with a total of 134 participants (73.9% women) between 18-58 years of age (M = 39.61; SD = 11.6) who practiced a varied amount of physical activity. There were no specific requirements for participation as a general population was sought. The study was of a cross-sectional design and the data was gathered through a digital survey and was published on several different Facebook groups, a variety of Facebook groups was sought and thereby the groups consisted of everything from training specific to culture specific. The dependent variable was measured by the Godin Leisure-Time Exercise Questionnaire (GLTEQ), the independent variable was measured by the Behavioural Regulation in Exercise Questionnaire (BREQ-4) and the moderating variable was measured by the Five Facet Mindfulness Questionnaire (FFMQ). All forms consisted of the Swedish translated version. The result of the moderation analysis was non-significant, which indicates that mindfulness does not moderate the relationship between self-determination and exercise frequency and was analysed through the SPSS add-on Process v.4.1. This specific relationship within the research field is undeveloped and it is therefore recommended that the results of the current study are used cautiously, until more studies contribute to a justified conclusion. / Syftet med föreliggande studie var att undersöka om dispositionell mindfulness modererar relationen mellan självbestämmande motivation och motionsmängd. Föreliggande studie bestod av en svensk population på totalt 134 deltagare (73,9% kvinnor) mellan 18-58 år (M = 39.61; SD = 11.6) som utövade en varierad grad av fysisk aktivitet. Det krävdes inga specifika krav för att delta eftersom en generell population eftersträvades. Studien var av tvärsnittsdesign och datainsamlingen skedde genom en digital enkät och publicerades på flera olika facebook-grupper, där variation eftersträvades och berörda grupper bestod av allt från träning- till kulturspecifika. Beroendevariabeln mättes genom Godin Leisure-Time Exercise Questionnaire (GLTEQ), den oberoende variabeln mättes genom Behavioral Regulation in Exercise Questionnaire (BREQ-4) och den modererande variabeln mättes genom Five Facet Mindfulness Questionnaire (FFMQ). Samtliga formulär bestod av den svensköversatta versionen. Modereringsanalysen utfördes genom SPSS tillägget Process v.4.1 och resultatet framkom som icke-signifikant, vilket innebär att mindfulness inte modererar relationen mellan självbestämmande motivation och motionsmängd. Denna specifika relation är inom forskningsområdet outforskat och det rekommenderas därför att resultatet beaktas med varsamhet, tills mer belägg kontribuerar till en befogad slutsats.