IMO, the 'ab work" is pretty lame. More a demo than a do-along.
And there are several places where they are off beat (Josef especially).
I have to do this one only briefly glancing at the screen from time to time, and not watching Josef's speed-bag/agility-drills feet segment much at all, because he's pretty off the beat of the music.
Luckily, it is easy to follow without watching, and if I just follow the music, we all end up at the same place at the end of the segment.