If you think a minute goes by really fast, you've never tried planking

Five minutes.   They took the time to make a five minute workout video.  That in itself had me concerned; the fact that it was titled "Core on the Floor" didn't help.  Okay so this is a supplementary video done after the Strength workout.  I really dislike the strength workout, so for a couple weeks I just skipped it.  Then I realized it was actually necessary as there's no upper body workout in the rest (or very little).  But that didn't make me enjoy it more, so my solution is to sub in P90X3's Eccentric Upper.  Which is technically harder than the Core do Force Strength workout, but I like it better and get more out of it, sobeit.   Eccentric Upper isn't nearly as good without a bar as it is with, but was still a solid workout.  And then stuck in the follow up workout.

Right, so the entire workout is done in plank or variations of it.  It starts with a normal plank but you rock forward and back.  Then the others are a bit of a blur -- there were side planks, normal planks on one leg, normal planks with feet moving in and out, side planks lifting hips up and down, and side planks with a twist.

Suffice to say I landed on the ground a few times; at least it's a short drop!  But, in my defence, I also kept getting back up and trying the next one.