<![CDATA[ABSTRACT Students’ understanding of a healthy lifestyle needs to be strengthened because adequate understanding provides a foundation for recognizing and adopting healthy living habits in everyday life. This study aimed to examine changes in students’ understanding of a healthy lifestyle following classical guidance using mind mapping as a medium among students of class XI BC-1 at SMK Veteran 1 Sukoharjo. The study employed a quantitative approach with a pre-experimental one-group pretest-posttest design. The participants were 33 students selected through total sampling. Data were collected using a healthy lifestyle understanding questionnaire consisting of 30 items covering six indicators: healthy eating patterns, physical activity, quality rest, stress management, positive social relationships, and wise social media use. Data were analyzed using descriptive statistics, the Shapiro-Wilk test, a paired samples t-test, and N-Gain. The results showed an increase in the mean score of 26.36 points and a significant difference between the pretest and posttest scores (t(32) = 23.05; p < 0.001). The N-Gain value of 0.580 or 58.04% was categorized as moderate and considered sufficiently effective based on the criteria established in the study. The findings indicate an increase in students’ understanding following the service; however, the increase cannot be attributed solely to the use of mind mapping because the study did not include a control group. The limitation of the one-group pretest-posttest design should therefore be considered when interpreting the findings. ABSTRAK Pemahaman murid mengenai gaya hidup sehat perlu diperkuat karena pemahaman yang memadai menjadi dasar untuk mengenali dan menerapkan kebiasaan hidup sehat dalam kehidupan sehari-hari. Penelitian ini bertujuan untuk mengetahui perubahan pemahaman gaya hidup sehat setelah pemberian bimbingan klasikal dengan media mind mapping pada murid kelas XI BC-1 SMK Veteran 1 Sukoharjo. Penelitian menggunakan pendekatan kuantitatif dengan desain pre-experimental one-group pretest-posttest. Subjek penelitian berjumlah 33 murid yang dipilih melalui total sampling. Data dikumpulkan menggunakan angket pemahaman gaya hidup sehat yang terdiri atas 30 pernyataan dengan enam indikator, yaitu pola makan sehat, aktivitas fisik, istirahat berkualitas, manajemen stres, hubungan sosial positif, dan penggunaan media sosial secara bijak. Analisis meliputi statistik deskriptif, uji Shapiro-Wilk, paired samples t-test, dan N-Gain. Hasil menunjukkan peningkatan rata-rata sebesar 26,36 poin dan perbedaan yang signifikan antara pretest dan posttest (t(32)=23,05; p<0,001). Nilai N-Gain sebesar 0,580 atau 58,04% berada pada kategori sedang dan termasuk cukup efektif berdasarkan kriteria yang ditetapkan dalam penelitian. Temuan menunjukkan adanya peningkatan pemahaman setelah layanan diberikan, tetapi peningkatan tersebut belum dapat dipastikan semata-mata disebabkan oleh media mind mapping karena penelitian tidak menggunakan kelompok kontrol. Keterbatasan desain one-group pretest-posttest perlu menjadi pertimbangan dalam menginterpretasikan hasil penelitian.]]>
