Music pitch (high/low); the metaphor is so embedded in me from pre-memory days that I struggled to accept that it's just a convention. Many other binaries (such as long/short) would work just as well.
Do you ever have visual experiences in dreams? It's like that, but you're awake.
I thought the exercise thing (like runner's high, feeling pumped, etc) were all metaphors, but I was surprised to learn other people actually felt good after exercise. Whatever it is, I'm missing the mechanics, and exercise is pure duty (so I try to get it doing other things I enjoy, such as walking my dog and chasing children around).
I've had the opposite experience with music, when I said a harmony made me feel shivers and the other person didn't realise I was being literal.
I have a fig tree in my front garden. It lives in a comically small pot of earth (relative to its size). Every winter I cut it back, and every spring it explodes in size. Without fail, every year, at least one person stops to ask how the tree gets enough from the pot to grow so much, and every year I explain that trees mostly eat air, not soil. These people are often keen gardeners! But it's not a commonly known fact.