The aim of this study was to examine the effects of online exercises on mindfulness, mental well-being and body image of adult females. A total of 33 people, 15 in the experimental group and 18 in the control group, participated in the study, which was conducted as a pre-test-post-test control group design. The data was collected by the Mindful Attention Awareness Scale (MAAS), developed by Brown and Ryan (2003) and adapted into Turkish by Özyeşil, Arslan, Kesici, and Deniz (2011); the Mental Well-Being Scale (WEMWBS) developed by Warwick and Edinburgh Universities and adapted into Turkish by Keldal (2015); Body Appreciation Scale (BAS) developed by Tylka and WoodBarcalow (2015) and adapted into Turkish by Anlı, Akın, Eker and Özçelik (2015) and Personal Information Form created by the researcher. In the analysis of the data, descriptive statistics, independent sample t-test and paired sample t-test were used. When the findings are examined, a statistically significant difference was found in the mindfulness, mental well-being and body image pre-test-post-test scores of the experimental group. It was determined that this difference was due to the high mean scores of the experimental group. There was no statistically significant difference in the mindfulness, mental well-being and body image pre-test-post-test scores of the control group. As a result; It has been determined that online exercises are effective on adult female's mindfulness, mental well-being and body image.