Posture is one of the indexes of the physical development. Today the Latvian children and adolescents are increasingly diagnosed with the wrong posture. The posture evaluation of 1049 children aged 9 was implemented in Riga preschools during the period of 2003 - 2008. The following methods were used for pusture assessment: expressdiagnostic method (Vasilyeva, 1996, Kasvande, 1998), plantografic method, shoulder-width index (Velitcenko, 1989). 30% of children were found to have a wrong posture. One of the most influential factors contributing to the wrong posture is muscle imbalance. From 2004 Riga 154. Preschool physical education and health lessons included the exercises to reduce muscle imbalances and specific exercises, which were based on the principle of sensomotor exposure. As a result, a positive dynamics was observed regarding all the indicators of children’s posture.