How many times during your growing years did your parents tell you to walk straight or sit up straight? You may have casually dismissed it, or maybe you didn't really pay attention. As an adult, though, you realise the wisdom of the advice.Simple practices like these don't just help you physically but also psychologically. Psychologists say that there are many little ways that can instantly help boost self-confidence. Here are some easy tips on how you can do just that.