Self-confidence is commonly defined as the sureness of feeling that you are equal to the task at hand. This sureness is characterised by absolute belief in ability. You may well know someone whose self-belief has this unshakeable quality, whose ego resists even the biggest setbacks. In such people, confidence is as resilient as a squash ball: the harder the blow, the quicker they bounce back. Nonetheless, although confidence is a desirable characteristic, arrogance – or a sureness of feeling not well founded in one’s ability – is undesirable. If self-confidence is perhaps the ‘guardian angel of sports performers’ then arrogance is their nemesis.