Why, you might ask.  Because you know your cashing for a good amount and you have a shot at top prize.

I can tell you that I am more relaxed at this stage than I am at any stage earlier in the tournament.  For the reasons above but also because I have had some time now to study my opponent and get a feel for his play.  I believe that gives me an edge.

This is where you have to be flexible as a player.  By that I mean you have to be able to change your style depending on your opponent.  Some opponents I have played will do nothing but push or fold heads up.  To me that tells me my opponent is not to confident in his post flop play.  That's ok, that's exactly what I might do if I thought I was up against a much better player.  If that happens and my opponent is pushing or folding, depending on my chip stack of course, I will wait for a strong hand and just call or check hoping he might push.  By strong hand I mean any ace, KQ, KJ, QJ, any pairs ...  Chances are my opponent will push if he has a relatively good hand.  With an opponent like this luck takes a bigger hand in deciding the winner.

On the other side of the coin, if I have an opponent who is willing to play post flop or seems a little tight I tend to raise more pots because if he calls you know he got something.  It is likely though that you can push him off more pots and pick up a fair amount of chips that way.

To me the trick is you have to be flexible going to heads up play.  You have to adapt your play so that your chances of winning increase.  It also keeps your opponents  guessing.  If you have suddenly started raising and pushing when most of the tournament you've been playing tight and aggressive your opponent won't know what to do next.  Keep him always guessing.  Make your opponent react to your moves.

In poker tournaments, I believe it is so beneficial to be the one acting forcing your opponents to make the decision.

Be proactive not reactive.  Reactive usually costs you chips and money !!

The worst thing you can be in poker is predictable !!