I often find myself in situations, where I'd love to greet someone that I barely know. For example: when I'm doing my workout routine in the gym, I see a person that I once helped to e.g. lift something. Though I don't really know the person I would like to greet him/her properly.
The question(s): How do I greet someone I just talked to once or helped once? What do I do if he/she is not looking towards me?
It's not that difficult with people from the same gender and age (I'm 22 years old male living in Germany), but it still feels weird to look more than usual towards him/her until he/she notices me.
It's not very important to me to get to know a person better, but I would like to increase the number of people that I can greet and also greet me even though they haven't spoken to me a lot. I think that would cause a way friendlier environment for all of us.