People who willingly sit in hot subway cars with no A/C during the summer: how do you do it?

This time of year I know if I see a car with minimal number of people the A/C is busted and it feels like an oven in there.

The thing that confuses me is that there seem to be people who will happily sit there on their commute. I feel like I’d collapse after a few minutes so I’m curious: if you’re one of these people, how do you manage it?