Big goals
Possible, but improbable. That's the best definition I can come up with of a big goal.
A big goal (all of us have our own version of it) should take you way out of what you're familiar with.
A big goal isn't a stupid fantasy. Making 5 million in 30 days is an example. Big yes, but impossible unless you plan to commit a scam of sorts.
A big goal is scary but in the realm of possibility. You know you can do it if you muster the effort.
You know you can't accomplish a big goal unless you stretch.
Impossible goals cause stress and anxiety.
Improbable goals make you wonder what all the possibilities are that lie ahead.