This is quite a different kind of normative sign. It’s a pictogram showing how to use a piece of exercise equipment, namely an ergometer (rowing machine).
I suspect there are 3 implicit messages, here.
- Here’s how to get the most out of this exercise.
- Here’s how not to get hurt.
- Here’s now not to end up wanting to sue us (the gym owners or makers of the machine.)
(Photo courtesy of Sam B.)