It has much less to do with the actual location as it does with taking the proper precautions. The worst thing about the idiot in the above video is he doesn't seem to understand that opening a gym is miles away from opening a gym and requiring proper masks and protection. They are both exclusive. You will find a lot of studies commissioned by gym companies to say there is no spread, but you will also see the opposite. The truth is somewhere in between of course, and has everything to do with PPE.
There is a growing segment of data that are starting to align with the prediction that restaurants, gyms, and so on are hotbeds of spread. This one is a long read but seems really robust given their sample size and methodology:
Mobility network models of COVID-19 explain inequities and inform reopening | Nature
The TLDR version is that they used google mobility data and compared visits to points of interest. The data encompasses something like 5 billion hours with half a million POI's. So it's well beyond a robust set, not like one of these 5,000 people studies put out by businesses. And it's going to be unbiased as there is no human element with interpretation and such, cell phone data doesn't lie, it just is. Their findings are twofold. First, there is a solid correlation that highly suggests that places like restaurants, gyms, shopping malls, and so on were superspreader locations back in the spring when COVID was first labeled a pandemic. This is unsurprising. Second, the data showed a very strong correlation with demographics related to income. Using gyms as an example, far more spread was seen at places like 24 hr fitness compared to a place like Orange Theory. This makes sense as well - you have far more people crowded together in Wal-Marts that at Restoration Hardware.
The biggest thing to note is that this pertains to the Spring, when many weren't wearing masks. It clearly points out that any location with a group of people indoors in close quarters is going to result in substantial spread if they aren't wearing PPE. I'm of the opinion that places like restaurants, gyms, and even movie theaters are not any more dangerous than a store, it's all about enforcing mask policies. Movie theaters are dark, for example, so how do you ensure it? How do you ensure a restaurant owner who is up against the wall financially will require them? The gym guy in the video is doing far more harm than good by promoting the impression that gym owners are a bunch of brainless meatheads. It ruins it for the places who are being responsible because they all get lumped in together.
There's a reason we are seeing a spike right now, and it's not because of any particular place that is opening up. It's pandemic fatigue. I'm in a closed classroom with students all day and we've have had zero spread here, all cases have been from off campus incidents. It's because we enforce PPE policies fanatically.