Well that’s good, because it is the least efficient walk. It’s even worse than binding your hands to your sides. It makes a kind of intuitive sense, but shocker, the way we’ve evolved to walk most comfortably is the most efficient. We swing our arms in part to reduce angular momentum. Anti-swing walk, swinging the same arm forward as the leg that is moving forward, not only fails to bleed that momentum, it adds more of it. Which we then need to spend even more energy to counter, with less efficient muscles. It’s the worst of all worlds. The only practical reasons to use it are to increase the intensity of your walks, or if you’re into some martial arts/kendo that relies on it.