What do you guys (especially women) do with your keys when you go for a run?

This is probably the silliest question that will be asked here all day but I’ve been living in New York for five years and have only ever gone to the gym - no real outdoor running. I want to try running outdoors now that it is getting nicer and I literally have no idea what to do with my keys. My phone I can put in one of those arm band things but I’m stumped on the keys. What do you guys do? Thanks!