How can I improve my posture?: understanding muscles I have written about this topic as it is good to understand what can occur to the muscles within your body. This will help you understand a little better what can occur in the body that can lead to ‘poor posture’. Muscle’s Elastic properties Muscles are made up of packages (known as units) of ‘elastic’ (rubber band like) fibres. These fibres are prone to becoming too tight or overlengthened (hypertonic). Within your muscles