At this point in her career, Ariana Grande wanted to be taken seriously, as an adult artist. And while she tries to mask the suggestive nature of the song with this video, with ladies moving... er, side to side on exercise bikes, it ain't about going to the gym. (Nicki Minaj, for her part, is a bit more direct.)
What this song is, even with its somewhat naughty premise, is a grown-up, densely layered dancehall-pop song that is surprisingly strong.
But what if you strip the layers and the overproduction? It's still a surprisingly strong song - Grande has a voice that, while still maturing at this point in her career, is evocative and still a little innocent.....sounding.