If you have muscle imbalances and do not use corrective flexibility to fix them you may develop posture problems which not only make your body look out of proportion, but can cause injury.
http://AskTheTrainer.com/posture-problems.html
Find Stretches for your Lower Body to combat muscle imbalances.
http://AskTheTrainer.com/leg-stretches.html
Upper Body Stretching Techniques
http://AskTheTrainer.com/upper-body-stretches.html