I’m typing this comment from the gym, actually. I’m on the friendlier end of the spectrum and really don’t mind helping out when someone could use some actual help. Giving a quick spot or a quick exchange of advice is common.

What I don’t enjoy is when someone ropes me into doing something for them when it becomes clear that they had other intentions for the request. It’s the ulterior motive part that can have the opposite of the intended effect.

When you realize someone asked the favor not really because they needed it but because they thought it would be an opening to get you into conversation, you start wondering what their real motive is. In this case it may be benign enough, but it’s not a great way to start a conversation

Yeah that's fair and I see it the same way. For example, when I visit the US and a waiter/waitress is extremely friendly (even asking about my personal life and complimenting whatever) it's usually clear (in most cases anyway) what they're after. But obviously I'm not talking about those situations, I was instead giving examples of genuine requests for help, not tricking people.