ITA!! And another thing... a warmup is
movement, active motions that get your heart rate up and move blood to your muscles. It is NOT sitting on the floor and stretching!!!
(I am looking at YOU, Denise Austin and Billy Blanks!) Even barre workouts understand that.
I'm not a fan of the warmups in Firm Express--I think they're too quick and the moves are confusing--but they're THERE, and they actually get the job done. Which is more than I can say for some. (crab, crab, crab)
There's no WU/CD in JNLF?! Wow, I will stop thinking I might be interested in it! An extra 5-8 minutes tacked on for at least a cursory warmup and stretch wouldn't bother me in a workout billed as 30 min. And you can do what FX did--some of the workouts clock in under 19 min, some are just over 21... but that's all pretty much 20 minutes IMO, so it doesn't bug me.