Participants will receive a 4-week hybrid body awareness-based intervention consisting of two face-to-face and two online sessions.

Participants will receive routine care without any structured intervention.

The intervention includes menstrual education, body awareness exercises, emotional awareness, and self-regulation strategies delivered through a structured 4-session program.

Measure: Menstrual Symptom Subscale;All items in the Symptom section are reverse-coded, and each subscale is scored separately; no total score is calculated. Higher subscale scores indicate a more favorable condition, reflecting reduced symptom severity. The possible score ranges are 5-25 for physical symptoms, 4-20 for emotional symptoms, and 2-10 for eating behavior. The scale is rated on a five-point Likert type (1 = strongly disagree, 2 = disagree, 3 = neither agree nor disagree, 4 = agree, 5 = strongly agree). In the original reliability study, Cronbach's alpha coefficients for the subscales were 0.76, 0.76, and 0.76, and McDonald's omega was 0.87. In the present study, Cronbach's alpha coefficients were calculated as 0.85, 0.84, and 0.86, respectively.

Measure: Menstrual Attitude Subscale; The Attitude section consists of 19 items and four subscales: perception of menstruation, discomfort and concealment, emotions, and perceiving menstruation as an indicator of health. Items 9, 10, 11, 12, 13, 14, 15, and 16 are reverse-coded in this section. Higher subscale scores indicate more positive attitudes. The possible score ranges are 8-40 for perception of menstruation, 5-25 for discomfort and concealment, 3-15 for emotions, and 3-15 for perceiving menstruation as an indicator of health. The sections of the scale can be used separately or together, and each subscale is evaluated independently to determine the level of menstrual symptoms and attitudes. In the original reliability study, Cronbach's alpha coefficients for the subscales were 0.76, 0.69, 0.65, and 0.70, and McDonald's omega was 0.83. In the present study, Cronbach's alpha coefficients were calculated as 0.90, 0.84, 0.89, and 0.95, respectively.

Measure: Adolescent Self-Regulation Scale; The Self-Regulation Skills Scale (minimum-maximum score: 11-55; higher scores indicate better self-regulation) was developed to assess adolescents' self-regulation skills. The scale consists of 11 items and has a unidimensional structure. Items are rated on a five-point Likert scale (1 = strongly disagree to 5 = strongly agree). In the original reliability study, Cronbach's alpha was 0.90, McDonald's omega was 0.89, and the Composite Reliability (CR) was 0.89. The test-retest correlation was 0.78, indicating temporal stability. In the present study, Cronbach's alpha was calculated as 0.92.