The current research aims to achieve muscular balance during sitting in front of computers through anatomical analysis of sitting position in front of computers, EMG analysis of working muscles during sitting position in front of computers and designing a compensatory exercises program for sitting position in front of computers. The researchers used the descriptive (qualitative anatomical analysis of sitting position in front of computer – quantitative EMG analysis) approach. Only one participant was purposefully chosen. She was a female employee whose work required sitting for prolonged periods of time in front of a computer (age: 23 years – height: 169 cm – weight: 75 kg). The researchers chose to perform research analyses in Kinematic Analyses Lab of Biomechanics Department – Faculty of Physical Therapy – Cairo University. 1-  Descriptions of various sitting positions in front of computer are as follows: Muscle groups with highest contraction during Lie Back 135̊ are: pectorals major – rectus abdomens – erector spinae – latissimus dorsi – deltoid . Muscle groups with highest contraction during Upright 90̊ are: rectus abdomens - pectorals major – rectus femoris - erector spinae - latissimus dorsi . Muscle groups with highest contraction during Lean Forward 70̊ are: rectus abdomens - pectorals major – rectus femoris - latissimus dorsi – deltoid. 2-  Descriptions of various sitting positions in front of computer according to EMG for contribution percentages are as follows. Lie Back 135̊: highest contribution for trunk movers. Upright 90̊: least percentage of contractions for all muscle groups . Lean Forward 70̊: highest contribution for pectorals major – rectus abdomens. 3-  There is no best position for sitting as the body should not stay on one position for too long. 4-  Fixed positions cause negative effects on the spine and its working muscles , 5-     Compensatory exercises are designed .