The goal of this cross-sectional study is to investigate the influencing factors of body image in women of reproductive age. The main question[s] it aims to answer are:

• Is there a connection between physical activity, body mass index and body image?
• Is there a connection between body image, premenstrual syndrome and sleep quality? Participants will fill out a complex online questionnaire.

During the research, the researchers use a quantitative method, in which the participants fill out the Knowledge of the Female Body Scale, the Global Physical Activity Questionnaire, the Body Appreciation Scale, the Sleep Quality Scale and the Premenstrual Assessment Form Short Form, as well as a general health status questionnaire. and a self-made questionnaire containing socio-demographic questions. In the course of the research, we form a sub-sample, on which we carry out further instrumental tests to monitor body composition and physical activity. The number of participants is approx. There will be 500 women between the ages of 18 and 45, who will be selected through targeted sampling. During the research, the data are processed in the SPSS v28.0 program and the following statistical methods are used: Kolmogorov-Smirnov and Shapiro-Wilk normality tests, Spearman and Pearson correlation analysis, Pearson chi-square test, linear regression analysis. During the research, the safety of the participants and the ethical rules are strictly observed.

Inclusion Criteria:

• women
• between the ages of 18-45 years
• regular menstruation

Exclusion Criteria:

• older than 45 years
• pregnancy
• amenorrhoea
• premature ovarian failure

women between the ages of 18-45 who reported symptoms of PMS during the period of parameterization of the target group