I am a huge fan of pillar training.
It's essentially a step up from core training as pillar training involves the shoulders, hips, AND core.
This week I gave all of my boot camp clients a killer 5-minute abs finisher involving pillar combination exercise... THIS WILL DESTROY YOUR ABS!
Here's the workout and companion video demo:
3-Way Dynamic Pillar- Perform 5 reps/way = 1 Round. Perform Max Rounds for Time in 5 Minutes