Should a banana be eaten before or after workout? And why?

A friend of mine who wanted to avoid the draft back in 1969 was told by his doctor to eat a banana then run the mile or so to the doctor's office, enter by the back door, and they would check his blood pressure. He was given a 4-F rating, not suitable for the military. I never understood how that worked.

I eat half a banana before and half afterwards.

I don't like anything on my stomach before a workout.

Either is ok

Before.
Afterwards, you might be so tired and sliw that the banana eats YOU!