TY JOUR TI Health-saving education as a factor of additional education of children KW project technology KW health-preserving education KW teaching biomechanics KW method KW sample Rufe –Dixon line JO Journal of Natural Sciences Research AU Shpet, V.V. AU Ovchinnikov, Y.D. AU Yakunina, V.A. PY 2019 IS 4 PB INFRA-M Academic Publishing LLC.