Challenging Fat Burning Abs Workout
Interval Routines (3)
The video below is probably one of the most challenging I've seen put together by Craig Ballantyne. I know after one set, you are probably going to feel the burn.
The cool thing about this workout is the variety of exercises that go into it. You've got squats, pull-ups, burpees, the plank, and more. I can't imagine anyone being bored with this routine.
This right here is what Turbulence Training is all about: