Nice tutorial. Lemon tip looks like a great progression since I find getting low enough and having the right angle to engage the slide the most challenging. Gotta train those glutes and quads.
I've never been able to do them, even after years of trying. I think I lack the leg/knee strength to skate in that 'sitting' position, but the half-lemons tip is really good so I'll give it another go.
I've seen in another video a tip to keep your weight on the non-sliding foot? I assume that is also the case here? I've been trying and I have been saying it feels impossible! I have a million excuses though, my wheels are too new, the ground is too rough, I'm going too slow, my legs are too short, I am too weak, I am too light, I am too old, I will break my knee, I will break my hip and so on ... But I will keep trying! The first technique you showed looks easier, but the second one is easy to remember: "first squat then pee" ...