Core Workout

Hate to move that previous photo down, but I guess some new content is in order. Has anyone tried the core workout in the newest Bicycling Magazine? Not the one pictured here, but the one with the dude and the chick on the cover showing off their abs.

That is some tough she-ite. 100 scissor kicks near the end of the workout? Sweet mother of pearl...

Just wondering if my core is that weak or that program is that tough.