Lumbar support, height/back/armrest adjustment, headrest, right fit for your body. In other words, features that promote good posture, instead of slouching. Nowadays I find most ergonomic chairs have pretty much the same features, and what differentiates one from the other the most is quality. Aeron and Steelcase are basically BIFL chairs, whereas a cheap chair from Staples or Amazon may last you a year or two before things start falling off.
The London Underground is actually kind of a dumb use-case because itâs fixed infrastructure.
On the other hand it's a perfect test bed, because there's sufficient changes of direction and speed, and the fixed infrastructure lets you measure drift. Plus it being underground helps simulate GPS signal being weak or unavailable.
I don't get why people are down voting this. Your approach is a perfectly acceptable blueprint for reducing meat consumption. Getting upset at you because you haven't fully embraced veganism is letting perfect become the enemy of good enough.
"Fry" can also mean "a very small fish."