It's just wrong.
The unwritten rule is that you have to be going slightly faster or slightly slower than the person on the rowing machine next to you. Otherwise it looks like you're in the same boat which you clearly aren't.
I've got the added problem of being ginger, and under no circumstances am I allowed to go on the equipment next to the other ginger in the room. This is very rare as I'm usually the only one. But people might think we're brother and sister.
I especially couldn't go on the rower and row at the same pace as the other ginger in the room. Can you imagine that? We'd be sibling boat rowers.
So AIBU?