Forgiving him depends on a lot of factors. If he is truly remorseful and willing to work on the relationship, it might be possible. But it won't be easy and will take time.
If you've caught your husband in such a situation, first, take some time to calm down. It's a very shocking discovery. You could consider having an open and honest conversation with him about why he did it, your feelings, and what it means for your relationship.
I'm not sure specifically as this could be a very unique or made - up scenario. It might involve a wife and a friend planning something unexpected or tricky in relation to the husband, perhaps in a comical or strange situation that has been named as such. But without more context, it's hard to say exactly.
I don't think it's common at all. Most stories in relationships focus on more normal aspects like love, arguments, and family life. The idea of a gloryhole in a story about a wife tricking her husband is quite out of the ordinary and not something you'd find in typical story collections.
There is no evidence to suggest that such activities occur in a gym environment. Gyms have rules and ethics in place to maintain a proper and respectful atmosphere for all members. This kind of description violates the basic norms of a public fitness place.