The first kind of fatigue doesn't seem to match up with the energy metaphor much at all. In this case, you think the activity will be exhausting, but when you actually get going, it doesn't feel so bad. The effort is all in the starting, not the doing.

This is the kind of feeling you want to push through. If you can overcome that initial hiccup to taking action, everything gets much easier.

The second kind of feeling might be something you encourage yourself to do for specific goals, but if your entire life feels that way for weeks at a time, your habits are probably unsustainable.