I have a very painful knee injury (both knees) that require me to avoid, as much as possible, going from a standing to sitting position and vice versa (I have little pain if I'm standing, a lot when I walk, go down stairs, or shift from a standing to sitting position).
Anyway, I had put off going to an Orthodox church for a long time, because I didn't know which ones had standing room only and no chairs along the wall, or standing room only WITH chairs along the wall, or pews.
The way things worked out, I found a church that has pews, but no one uses them except the elderly and me (sometimes). I need the pews to hold onto while standing, because even though I have less pain while standing, sometimes my knee buckles and I need to grab something. I feel self-conscious bringing a cane, so the pews work out fine for that. I can't kneel at all, and though the church has kneelers, I have not seen anyone use them.
I could probably do the stand-sit-stand thing if I took some of my prescription strength 600 mg ibuprofen before heading off to church, but with the havoc that stuff wreaks on the liver I try to avoid it as much as possible. Pews to hold onto are safer!