nostr:nprofile1qy2hwumn8ghj7un9d3shjtnyd968gmewwp6kyqpq2fu3urqntak7lk9xw40k3u2pjq0q5tgy5fd7rvdvycgjzvrkuz7qvlxju8 I was thinking about if it's functionally different for the back than hanging from a pullup bar. Then I remembered a guy I met who got stuck in one upside down for a while.