Over at Pavel Tsatsouline’s Kettlebell blog, he states that kettlebell lifters are known for their rock hard abs.

He says that you can go beyond the basic kettlebell lifts like swings, military presses, and front squats and try lesser known exercises like the “slingshot”, the “figure eight”, and the “hot potato” for an intense midsection workout.

Detailed descriptions of how to do the above exercises are here.

He goes on to say:

“Not only do these RKC drills smoke your abs, they teach you how to ‘match your breath with the force’, a skill critical to a fighter or an athlete.”

I’ve personally done both the “hot potato” and the “slingshot” and I can attest to their ab-burning abilities!