Do you wonder why one shoulder feels different than the other, or why on just one side your low back feels tight?  It probably has a lot to do with your everyday movement patterns, including sitting too much.  When I started as a personal trainer I had no idea how much of my programming for clients was going to be geared toward fixing pre-existing postural and alignment problems.  There are simple everyday actions you can take to prevent further damage.  Maybe you think its all OK at the moment, well take a look here to see all the health hazards associated with sitting too much.