"Commuting" = "going to work", however you do it. If you work seven days a week, and you are using your bicycle to get to work seven days a week, then you are commuting by bicycle seven days a week. If you are using your bicycle as your primary transportation method seven days a week, but only using it to get to work five days a week, then you are commuting five days a week and using your bicycle as your primary transportation method seven days a week.

And yes, it's perfectly okay (not sure why you're asking though, you don't need a permission slip). Just because it's your primary transportation method doesn't mean you don't take a day off -- that's just a day when you don't go anywhere, but stay home and rake the leaves instead.