maybe we have a toxic work culture...

Oh Captain Obvious strikes again. Don't be stationary. Movement is life.
Do not sit all the time, do not stand all the time.
“Take regular breaks, walk around, go for a walking meeting, use the stairs, take regular breaks when driving long distances, or use that lunch hour to get away from the desk and do some movement.”

When I last worked an office job I did a 45 minute walk at lunch hour every day, without fail, It was all that made that job possible.