If you ever find yourself getting tense or stressed out at work, there is an exercise which can help you. It was developed by American physiologist and physician Edmund Jacobson in the late 1930s, and it works on the basis of gradually tensing and then releasing tension in individual muscle groups in sequence. Muscles are always more relaxed after being tensed and released. This practice automatically brings physical relaxation which, in turn, calms the mind and our emotions. It works particularly well in reducing anxiety and insomnia but also in improving concentration and increasing self-esteem and a sense of control over moods. The whole practice lasts for 15 or 20 minutes, and the more regularly you practise this, the more you will get from it.