Respectfully, I think you're looking at this from a bad angle. You wouldn't go up to someone in the middle of a set, wearing headphones, and ask them to stop what they're doing to help you. Instead, you find someone who's finishing a set/exercise and politely say something like "hey, I'd like to try this exercise and you seem to know it well, would you mind taking a moment to give me a hand?".
I've personally done this twice this year (I genuinely wanted to learn, I'm not using it as a strategy) and it worked very well. I suppose culture plays a role but I'm in one of those countries where people don't usually socialize with strangers and it still works.
I've personally done this twice this year (I genuinely wanted to learn, I'm not using it as a strategy) and it worked very well. I suppose culture plays a role but I'm in one of those countries where people don't usually socialize with strangers and it still works.