Return back to Balfonheim Port, where there’s another side-quest - or rather a mini-game - you can partake in. Head to the Saccio Lane area (the southwestern-most area) and talk to Rikken a few times until he asks if you “care for a bit of sport”. Agree and you’ll start a race, which is as simple as can be, all you need to do is alternately press [X] and [Circle] to keep momentum.

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Rikken will challenge you to a good natured race - well, jog - if you bother him enough (left) and if you win, you’ll gain a prize (right).

It doesn’t take much (read: any) skill, but you’re probably better off putting the controller on a stable surface and tapping the buttons in tandem. It’s also worth noting that the route Vaan runs (or rather, jogs) is random. Sometimes he’ll run a tighter, shorter distance to the right, while other times he’ll take a wider route by running left. The speed of your competitors is also fairly random, sometimes they’ll barely be competitive, other times they’ll leave little room for error. You cannot use Speed Mode to speed this process up, unfortunately. Victory will earn you random prizes, most of which are cheap, basic curatives, and given that there are no fewer than 100 tiers of races to indulge in, you could be at this a while, if you’re so inclined. The rewards are listed below:

As you can see from the list, most of the items are low-quality curatives you could easily buy from any general goods merchant. The infrequent, large Gil rewards are tempting, but there’s better ways to earn Gil ahead, which will render those rewards moot, too. All in all, aside from a few somewhat interesting motes and loot items, there’s not really a good reason to waste your time with this mini-game if you don’t want to.