"Así" is a slow-burn dance-floor flirt from Portuguese singer Mickael Carreira, sung in Spanish. It opens with total confidence: "Tú ya lo sabes" (you already know it), "y nuestros cuerpos hablan el mismo lenguaje" (and our bodies speak the same language). He can tell the other person is pretending to be fine ("Tú disimulando que estás bien") and wonders what they miss, since a past love never filled them up.
The chorus is the whole point: "Tú me calientas cuando estás cerca" (you heat me up when you're close), which in Spanish is a pretty direct way of saying someone turns you on. Then comes the command in the title, "Así, muévete así" (like that, move like that). The song plays heat against cold too: the other person became "un hielo" (a block of ice), and "el frío que dejas cuando te alejas" (the cold you leave when you walk away) is what he can't stand. Handy word to steal: disimular, to pretend or hide how you really feel.