Theres a gym I work out at, and that I have been going to for nearly a year now, and they have an app you can use to check in, schedule classes, whatever. I don't actually know because I never downloaded the app, I just use my phone number to check in every time I go. I don't want more apps on my phone, not for the gym, not for fast food, maybe my bank and the apps I need to communicate with friends and family, but the majority of it is pointless bloat they push on you for no good reason.