Whilst watching an interview by one of the rowing crews of Great Britain one of the rowers mentioned the term "calm intensity".  This is a great wat to term how an athlete should approach the mindset of competition. 

Athletes should be calm and relaxed as when an athlete does this they can 'do without thinking' and compete in the present.  Very similar to how children play in the park.  If they are relaxed then they will also expel less energy and this energy could be the difference between winning and losing.  All skills are performed best when the athlete is relaxed.  If you are calm and relaxed also allows you to focus on the things that matter, you are controlling the controllabes.

At the opposite end of the spectrum is intensity.  How can you be clam and have intensity?  The intensity comes from focussing on the things that matter, the things you can control.  Your intensity is the focus on the processes, on the elements of competition that you can influence and that matter.  The rowers also mentioned another term which was to "stay in the bubble".  This so important and by being in the bubble you can control the controllabes because there is no focus on the things outside the bubble.  It also allows you to remain 'calm intensive' becuase the thing that can make you stressed and distracted your not focusing on and so are irrelevant.  By being in the bubble gives the perception that you are calm because nothing else outside of the bubble matters.