SPIN is pure frontier swagger. It opens in a dusty wasteland: the singer brushes off buzzing flies, squints at the horizon, and listens to the beat of hooves with 刻む馬蹄の音 [the sound of hoofbeats keeping time]. The sun is blazing, his body temperature climbs, and the steam around him turns him into a locomotive. If you know this is the opening of JoJo's Bizarre Adventure: Steel Ball Run, a horse race across America, the imagery clicks right away. Fun word to learn here: 荒野 (kōya) means "wilderness" or "wasteland", the classic Western backdrop.
Then the song turns inward, which is the best part. The race stops being about winning: 競技は超え 都度美学磨くようになる [going beyond the competition, each time I polish my own sense of style]. And my favourite line, まだあるフロンティアは内側 [the frontier that still remains is on the inside]. The chorus is honestly a bit funny, because he admits his head is the same as always and he just wants to 愚かさと踊って [dance with foolishness]. By the end he is feeding firewood into the dusk and shouting 回れ回れ ほら [spin, spin, come on]. Notice 回れ is the imperative of 回る (to turn, to spin), so the title is basically an order he gives himself.