Ab Crunches

A) Has anyone ever tried, this 10 minute FB Workout:

1l) Fitness Blender 5x5x5 Pulse Workout for Abs and Obliques

https://www.fitnessblender.com/videos/fitness-blender-5x5x5-pulse-workout-for-abs-and-obliques

It's an oldie; but a goodie, I felt every crunch!

Tried doing this, a "2nd" time for 20 minutes, LOL