I don't know any athletes that train 7/365, although in fairness, I only keep up with several dozen (ex- and current clients, and trainers that I work with). T

I don't know any athletes that train 7/365, although in fairness, I only keep up with several dozen (ex- and current clients, and trainers that I work with). The level of training we work at is more intense than typical; the body breaks itself down and fails after too much of that. If we consider walking to be "exercise" then sure, I suppose they "work out" every day. Regarding [2], without reading it yet, if it isn't separable, then it could be burnout or depression. Not being able to distinguish between the two doesn't mean they're the same thing, it means precisely what it it says--you can't tell which it is. The bottom line is that everybody is different. Some people will get burned out, some people will get depressed, some people will be both, some people won't. "Micro-rests", e.g., having a fulfilling life outside of whatever the cause of burnout/depression is, is still rest.