Sedentary behavior is often mentioned as a factor of posture disorders and low back pain. Despite this fact modern man spends most of time in sitting position. Therefore, physiotherapists and physicians recommends many different sitting positions to prevent and treat negative effects of prolonged sitting in poor posture. Lack of unified guidelines of the best sitting posture is a topic of discussions. Because of negative consequences of sitting in slump posture such as stretched supraspinal ligaments and low back pain some recommendations suggest lordotic lumbar posture that decreases nucleus pulposus pressure, lesser compression load of anterior part of intervertebral disc and provides better shock absorption during movement. However, this position can be related to higher compression of intervertebral joints, increased back muscles activity and back discomfort. Therefore, several studies suggests sitting with slight flexion of the lumbar spine as it lead to even load distribution on intrvertebral disc and decreased compression of intervertebral joints. The analisys of many different studies and contradictory opinions shows that one ideal sitting posture doesn’t exist. Sitting position should be chosen individually in regard to the inter-individual characteristics of musculoskeletal system. It worth also noting that every position (lordotic or kyphotic) maintained for a prolong time leads to discomfort and soft tissue symptoms.