The video below is from the very beginning of my long line session with Charlie one day. Unfortunately Dan's phone died right before Charlie really relaxed and started working but if you've seen any of my previous lunging videos you can appreciate the change even from the beginning.
Sometimes we do the round pen, other days I hook up some long lines like above. Occasionally I'll just let Charlie loose in the ring and do free ground work, interrupting our sessions with a grooming session or play time, throwing things around (balls and ropes and such) to get him used to weird noises/sights.
Of course I ride too, sometimes getting motivated enough to do a concentrated flat lesson (usually after I watch some particularly inspiring professional equestrian video on Facebook), but I just as often will hop on bareback. I love that I can pretty much just get on and go now without worrying about what kind of horse will be beneath me. The video below was after he hadn't been ridden in a week.
Charlie's canter is so much more balanced than it was even 6 months ago and he's able to hold himself up a lot better and control the impulse. We're still working out stiffness in one direction but it's improving every day.