Lets face it, mom was right, and all those reminders to stand up straight and stop slouching were for good cause. Posture, good or bad, involves training your body. The ultimate end is to "posture" yourself at all times in a manner that creates the least amount of strain to your body(muscles/ligaments) as it fights gravity and/or daily movements and exercise.
We constantly have to fight against gravity. We always have a force of resistance in our basic movements and daily activities. i.e. standing, sitting, sleeping, sit to stand, bending and reaching. Overtime those forces can gradually change our posture and muscular structure, even mal-forming areas like your spine and shoulders. Combining massage and exercise will help strengthen the supporting muscles and make sure all connections are firing properly to give you the most quality out of lifes daily rigors.