This two-hour Katy Perry concert film is presented by Epix, in one of its free audience sampling weekends – so if you can find Epix on your cable or satellite system, you can see this even without subscribing to Epix. It’s the sort of lavishly produced and costumed show that not only makes you understand why Perry was tapped to perform at the Super Bowl earlier this year, but suggests that her concertgoers got much the same sort of show. And Katy Perry, in this full show, gets a workout to rival many Super Bowl athletes: while singing every song, most of them anthems, she dances, runs in place, skips rope, cracks a whip, hands out pizza… basically, it’s an aerobics workout set to music, and the fact that her front-row audience members sing along with every word is both a little impressive and a little frightening.