Canfitpro-certified personal trainer Emily Thorne, or Emkfit, has this Taylor Swift workout that lasts around 20 minutes. If you haven't done a workout from Thorne before, here's how it goes: you'll alternate between two choreographed sequences for each song, working in intervals of 20 seconds on, 10 seconds off. It's fun, upbeat, and sweaty Betty (though "Betty" is sadly not one of the songs).