By the way, I'm 400 pounds. I know your struggle. I've lost well over 100 pounds playing StepMania before. Unfortunately I've had some bad events put me in a bad depression, which caused me to gain it back.
As an arcade gamer, myself, I've never seen anybody who could play a DDR game like someone who put the time in as part of an exercise regiment. It's so cool to watch. Like other game masters, but that much more impressive for the physical commitment.
When I run into an exercise gamer at the arcade, I always stick around to see what I can learn by watching. I can often spot them by their vibe - there's a recognizable patience of someone who already committed to getting their steps in, and is just waiting for the machine to free up.
Admittedly, I usually I don't learn much by watching, because I'm not anywhere near their league. But I have gotten some great beginner tips from the ones who hang around between sets.
Anyway, mad props. Playing those games for health tends to elevate it to a high art form. It's crazy cool to watch at the arcade. I suppose any sport can, but of course 'dance' is right there in the name.
Edit: Also, sorry you're dealing with setbacks. I hope things ease up for you.