If you want to get better at running, you need a strong core, which is why the world’s best marathoners do this challenging core workout two or three times a week. Unlike most abs workouts, it doesn’t contain a single sit-up, but instead relies on long sets of leg raises and plank variations to improve your core endurance.
When I say the sets of each exercise are long, I mean long. I tried the workout and as a 2hr 27min marathoner myself I’m in pretty good shape, but I barely made it through any of the moves without an extra break or two.
