Yep, just back and forth, make sure your eyes fully focus before switching. What I do is roughly 2 sec near, 2 sec far, etc, whole thing takes me maybe 30 seconds, but some people say to do it much more or wait as long as 10 sec before switching. Make sure to do it outside in the sunlight. Oh, and if you notice one eye focuses better than the other, then try it with just the bad eye.

There's all sorts of discussion online and it's a pretty heated topic, flamewars, paid courses, forums, some people say it can only prevent it, some say it can reverse it, some say it does nothing, some will ban you for talking about it, etc. Then there is the even more controversial theory that you can recover from serious myopia with the "reduced lens" method. The popular opinion is that that's impossible, but there are a good handful of datapoints to the contrary. Personally, my myopia was never that bad, so I never got too deep into that stuff and just did the basic near-far-near exercises outside in the sun and that was enough to reverse the small decline in my vision.