TrainAway might be a bit more popular than ShotTracker. We know about 1 link to it since March 2021 and only 1 link to ShotTracker. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Https://stathead.com/ and https://shottracker.com/ are good to but they are subscription based. Source: about 3 years ago
Trainaway.fit is probably the closest thing to what you mentioned, as they cover many countries. However, they only sell day passes. I used them a few years ago. Source: almost 2 years ago
Steam Charts - An ongoing analysis of Steam's concurrent players.
Gympass - Gympass is a fitness discovery platform connecting the world's network of fitness facilities to companies and its employees.
Steam Tools Hub - A set of Steam related WebApps built around trading cards, emoticons and backgrounds.
Classpass - Workout at the best studios in your city.
GameAnalytics - Free n' Fast Game Analytics
Fitt - Discover health & fitness in your city