The key to making this workout effective is choosing a controllable DB weight. No need to go too heavy. When you are warming up, dial in your form; if it's slop free you know you won't be wobbling around underneath a skull crusher weight. Then get it on and work on pacing the runs!
Five rounds for time of:
Turkish Get-up, 45 pound barbell, 21 reps
Run 400 meters
Here's an interesting post by Dr. Davis. He makes a good argument for sticking to more natural foods when getting rid of sugars and wheat from our diets. Great info on additives that we see in so many "healthy" processed foods nowdays.