You have a issue that needs to be solved. and just 'fighting' it out is the way to solve it. You went to the small room, where your small problem was present; your coworker. You said you are cool, but there is something about him that bothers you, its not a big deal. its a small issue, but can grow into a larger issue if you do not squash it now. as seen in your dream after you knocked him out and went to the next room which was larger... you had nothing to fight, you didnt have to face that big issue with your coworker, because you sqaushed it when it was small. the problem was solved and you left the building.
,
you woke up
because you prob are wondering why someone you are cool with, you are knocking out at a boxing gym. subconciously your mind is letting you know, something about him irks you, and can grow. but if you squash it early like you did in your dream, it wont turn larger (hence the larger gym)
what do you think? could that be it? if, there is an issue, you cant go at it like a wimp, you have to be firm and really let him kno what it is.
maybe that can help you understand the dream, or give you an idea of how to apply it reality
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