Johnny Cash is burning. The almost-life-size portrait of the singer tattooed on Alan Belcher’s left arm roasts in the midday heat, but the UFC champ hardly notices as he leans on the tricolor ropes that surround the ring. His sparring partner is late. And as the temperature rises under the open-air gym’s bamboo-and-aluminum roof, so too does Belcher’s impatience. And then. . .action.