Super-low ABV beers which are almost alcohol-free are often likened to isotonic drinks. The reason being that the sugar levels in a typical isotonic drink are similar to those found in the human body. The same balance occurs in a low ABV, low calorie beer.
What's more, given the quality of the water used in Rothaus beers, the non-alcoholic Pilsner, for instance, is high in vitamin B and high in carbohydrate β both useful when you working out at high intensity.
It's no surprise then that Rothaus like to get their name onto all the major sporting events in Germany!