Unbeknownst to all the Disciples who participated in the first test of a marathon, Magnus Carter was actually monitoring each of them just as he had done so in the past.
He never told his Disciples about it so they wouldn't know whether he was aware of their diligence or their laziness. In any case, this had been an unbreakable habit for Magnus Carter and it allowed him to guide each of his Disciples accordingly.
Had the Disciples known that Magnus Carter was keeping close tabs on them, they'd have done their utmost in challenging themselves and breaking through their limits. However, because they were presumably left to their own devices, most of them stuck to the bare minimum.
Since this was Satoshi's first time joining his marathon, he was curious whether he'd carry more weight or not. There was also the option of using his superpower, and Magnus Carter looked forward to that as well.