Double Kettlebell Rack Walks
These are excellent for developing work capacity and strengthening your trunk and core area.
It's important to keep the elbows low, hands tight together.
Do not elevate the KB's with your elbows as this takes stress away from the trunk and abs.
If you walk over 40 ft you'll start feeling this to become quite the full body movement as your legs will get a heavy workout.
The first rep, which is the double clean, is the power rep, so make sure it is explosive and agressive through the hips.
At the end, squat down with the bells or lower them as you would a clean.
I have seen sloppy finishes here where athletes just hunch over and have no bend at the hips.
Don't be lazy, lower the weights safely and correctly!