I can't bring myself to ask someone on the bus to give up their seat so I can sit. I'm 30ish and usually I can walk and stand okay, but I get dizzy a lot and my balance isn't great, I have chronic pain, and I have problems with my arms that make it harder for me to hold on. I always think, what if those people need the seat more than I do? Am I really disabled enough to ask someone to give up a seat for me? But it's not a great feeling when I see someone who's been taking up a seat in the priority area get up and walk around on the bus while it's still moving, well before the next stop, without any apparent difficulty. If you didn't need to sit, why were you taking up that spot?