Yes, all of those things. Some runners are afraid to rest because they think they will lose their ability to run if they don't run every day. They're just neurotic. It's okay to rest a day or a week or a month or even a year. I've been distance running since the age of 13 and it's necessary to rest sometimes. There's no shame in resting, and ability to run will not be lost unless there's some irreversible injury, which is rare for most healthy people.