Silver says that he trains hard in order to surpass Lilia one day, and to become a great knight capable of protecting Lilia and Malleus.
He says that Lilia once told him “Human lives are fleeting! There’s no time to bemoan your inexperience!,” which he interpreted to mean that “time spent complaining could’ve been time spent training.”
He will often mention training, saying that the hills in Clock Town mean that “sightseeing doubles as conditioning” and when Jamil mentions wanting to go backpacking somewhere with a lot of snowfall Silver observes, “Snowy paths make for sturdy legs. A fine choice.” (Jamil: “It’s not because I want to train.”)
When the Rabbit Run maze of the White Rabbit Fes event fills with steam so thick that he can barely see in front of him Silver says that it is “hardly a hindrance” when compared to his usual training, and he has a Fairy Gala voice line of how his training should serve him well in keeping everyone safe.
He also mentions Vil braiding part of his hair back, possibly so that he will be able to see better, which should help him when he is training (“I should get him to teach me how to do it later”).
He mentions training during Tsumsted, saying that he saw the tsum taking a cold shower at maximum water pressure and maybe he should try sitting under a waterfall, too, as it could be good training, and inviting the prefect to train with him and the tsum.
He describes Fairy Gala preparations as training that he has never done before (“I’m sure a little perseverance will get me through”) and he has a voice line about struggling with his runway walk, despite how he is “usually good at athletic things.”