A thing that is very important about rituals is that there are almost always triggers of when the ritual should be performed. Often that trigger involves being in a specific place.
For exercise, that trigger is going to the gym.
For work, that trigger is going to the office
For religion, that trigger is going to the church / temple / etc.
When you deprive people of the ability to be in the correct place, then their trigger is blocked and their rituals don't happen.
Yes, you could retool your rituals (work from home is the biggest example of this), but for many things, the motivation or desire just isn't there.
The spaces are too important to the ritual itself.
So I can totally see why people would want to go to the gym even if they weren't supposed to.