This is a bit difficult to describe in words. It can be "together apart together apart" or " up down up down" depending on how you want to look at it. Both are correct. Sexyloop describe more according to Mel Kreiger methods. Try the Lefty Kreh method which actually makes more sense.
Practice with single haul first.
As your rod tip flex at the stop pull with your hand line few inches, as your rod tip stops, your hand line should feed the line back to the rod with your hand line close to the reel. Same for the forward stroke. As your rod tip moves forward and before coming to a stop start the haul pull and let go.
Not an easy technique to learn, both your hands have to coordinate the timing. I'm still learning it and have not master it at all.
Here's some links for your information. Hope this helps.