Pocket Gamer very much doubts that there's one element of an Olympian's preparation that takes priority over all the others. As well as being generally fit and ready for taking part on the day, athletes and sports men and women have to be fully versed in their sport, confident, skilled and prepared for stepping out onto the arena in front of the world's cameras. Simply focusing of just one element would lead to the disaster otherwise known as last place - usually where the Brit resides.
Of course, trying to communicate such intricacies on a mobile phone would lead to an overcomplicated game that'd be a chore to play. So Humagade's ode to the Olympics chooses to highlight just one part of an athlete's make-up: timing.