One cannot help but be a little cynical as to some of the, shall we say, momentous leaps on the leader board. As a small example I was somewhat surprised to note that in the space of a day I'd dropped one place in my country's ranking. Not much you might say, however before that happened, the player below me had 11,000 calories less than me, and the person above 31,000 more. A differential if you like of 42,000 between those two. Now neither of these had scored anything more so someone had somehow leapfrogged the three of us. In addition as the next score for the person two above me was yet a further 29,000 away, a miraculous player had somehow achieved a minimum of 71,000 calories in a day!!!
Because I only look at players one or two places either side of myself, I have no idea who Superman, or indeed Superwoman, is. Whoever they might be, I can't really see the point in whatever method was used to do this. Most of us earn our points fairly and squarley, and this sort if thing tends to take the fun out of tracking your own progress.