How it's described in the article.
I was diagnosed one or two years ago with a problem where my lower esophageal sphincter doesn't close properly (took an endoscope rummaging around in my stomach; not a pleasant experience), and I think my lower esophagus is too wide. It causes stomach acid to flow up, especially at night, and especially if I ate something late in the evening.
They said quite a lot of people had this problem (1 in 20? 1 in 5?), making it sound like some unavoidable problem that I just need to treat by not snacking in the evening, taking daily pills that reduce the amount of acid my stomach produces, and maybe sleeping on my left side, so gravity keeps the contents of my stomach where they need to be. But if it's possible to train these muscles, that might be worth trying too.
> The resistance was provided by positioning my head below my stomach in a kneeling posture. This required food being swallowed to be pushed up an incline. I began eating part of each breakfast (oatmeal) and sometimes lunch (a sandwich) in the exercise position. I would kneel on a platform (which happened to be 6 ½” high), take a normal mouthful, chew it as needed, and prepare to swallow. I would then lay my forearms and the backs of my hands on the floor, rest my head on my hands, and complete the swallowing process. With a little practice, I was soon able to initiate and complete the swallowing process with my head resting on my hands on the floor. I did not attempt to determine what the optimal height of the platform might be or if, indeed, any was necessary.