I hate the term "core strength" because it sounds too much like faddish fitness lingo, but since it is widely used, I'll use it here. The Turkish get-up is a throwback to the old "strongman era" of strength training, when functional and effective exercise was the rule rather than the exception. Because of its effectiveness, it is still widely used today to train "core" strength and stability. All runners should consider adding this exercise to their strength training routine.
This video is a quick look at the exercise.
This video is a more detailed look at the exercise.