Sitting in the correct position is very important, and this fact as now become very well known and publicised. Many companies have had to rethink our their employees are treated in respect of office equipment, and this in turn as resulted in extending comforts to the home IT environment.
I once used a typical 'typist' office chair, which had a primitive back support and no side handles. Changing to an executive style chair with correct back and arm support plus gas suspension as made a vast difference, both in comfort and practical use. Yes the luxury cost quite a bit extra, but it as repaid for itself many times over.