One thing I’ll add is that people are pretty much always happy to spot you - I’ve found gyms to be some of the friendliest and supportive places out there. I know it can be a little daunting but I’d encourage it.
Yes, so much this! Most people will be really happy that you've chosen them to ask to help. Just communicate clearly how/when you'd like them to step in beforehand.
Others have covered things well.
One thing I’ll add is that people are pretty much always happy to spot you - I’ve found gyms to be some of the friendliest and supportive places out there. I know it can be a little daunting but I’d encourage it.