Artemis BJJ (Easton Road), Can Sönmez, Bristol, UK - 09/09/2019
In order to progress from low to high mount, the main barrier is going to be their elbows. There are several ways you can remove that barrier. There is the brute force method, yanking their elbows out of the way and driving your knees up into their armpits. I wouldn't recommend that method, though it can work. A more reliable option, with greater finesse, is to put your hands on their shoulders. Keeping you arms straight, lean forwards to put all your weight through your arms. That should lift their elbows, enabling you to slide right up into high mount.
The ezequiel choke is another way to get them to lift their elbows: as soon as they give you that space in their attempt to defend, shove your knee into the gap. To really fire the leg forward, you can push off your toes. Another option is to simply keep walking your feet up their sides, as if you were climbing up a wall. Every time you see a gap, fill it, until eventually you're up really high and their bridge is nullified.
Grabbing the top of their head and driving your hips forwards is another possibility, using that leverage to raise their elbows. To further help that motion, you could try hooking an elbow and 'spider-walking' your fingers up the mat, aiming to bring their elbows away from their body. Once you have gotten up into high mount, make sure they can't wriggle back out by blocking their shoulders. You could do that with your elbows on the mat, grabbing their head or indeed the cross-face.
Teaching Notes: I think this format is just about where it should be now. Start with a very quick summary of low mount, then mention the caveperson arm rip, followed by another quick summary on ezequiel choke (just saying how you're trying to raise up that elbow). Still not sure if I should include that or not. Finally, the finesse one, leaning into shoulders. That's followed by tech mount switch, then using elbows, hand or cross face to keep them in high mount.
A number of people were asking for more details on ezequiel choke, but not too many. Should I cut it? I mean to every time, but it's a useful way to move up to high mount. Hmm. Or I should just teach ezequiel choke after the low mount maint class next time? That would also make sense.