ABSTRAK Latar Belakang: Kondisi underweight dapat memengaruhi tumbuh kembang anak. Olahraga dapat menstimulasi sekresi human growth hormone (hGH) dan endorfin. hGH dapat meningkatkan sintesis protein, meningkatkan massa otot, sementara endorfin dapat memperbaiki mood anak, memperbaiki nafsu makan anak, sehingga asupan makanan anak meningkat. Tujuan: Membuktikan perbedaan indeks massa tubuh sebelum dan sesudah latihan Senam Sehat Anak Indonesia pada anak dengan underweight. Metode: Penelitian

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... perimen one group pre post test menggunakan 12 subjek penelitian dengan purposive sampling. Instrumen penelitian menggunakan timbangan dan microtoise. Analisis data menggunakan uji t berpasangan. Hasil: Rerata indeks massa tubuh sebelum dan sesudah perlakuan dengan rerata sebelum perlakuan 13,40 ± 0,55 kg/m 2 dan 13,9±0,59 kg/m 2 setelah perlakuan serta nilai p=0,005. Simpulan: Terdapat perbedaan bermakna indeks massa tubuh sebelum dan sesudah latihan Senam Sehat Anak Indonesia pada anak dengan underweight Kata kunci: Senam Sehat Anak Indonesia, indeks massa tubuh, underweight ABSTRACT THE EFFECT OF SENAM SEHAT ANAK INDONESIA ON BODY MASS INDEX IN UNDERWEIGHT CHILDREN Background : Underweight conditions can affect child's growth and development. Exercise can stimulate the secretion of human growth hormone (hGH) and endorphins. hGH can increase protein synthesis, increase muscle mass, while endorphins can improve the mood of children, improve the child's appetite, so that the child's food intake increases. Aim : To prove the difference of body mass index before and after Senam Sehat Anak Indonesia in children with underweight. Method : One group pre post test study using 12 research subjects with purposive sampling. The research instrument uses scales and microtoise. Data analysis using paired t test. Results : The mean body mass index before and after treatment with a mean before treatment 13.40 ± 0.55 kg/m 2 and 13.9 ± 0.59 kg/m 2 after treatment, with the value of p = 0.005. Conclusion : There is a significant difference in body mass index before and after Senam Sehat Anak Indonesia in children with underweight.