Living in Present

I was having a discussion with a friend of mine who has read some psychology books and seems to have some knowledge on the area.As per him,living in present is the most difficult thing one can ever do.We either live by worrying about the past or future.Whatever we say or do,we do it on the basis of what we have done in the past.The past keep harping us.Its like you wake up from your sleep and the bootstrap loader starts to load all the past information on to your brains.There is no alternative ,but to live in the past in that case.Through yoga,meditation and other aspects, one can try and remove those barriers of living in the past.
Only those who live in present are true winners.A case in point is Roger Federer.He can hit the shot wherever he wants to and aims for ,during his peak level.It is because he lives in present and hence has a single focus.The same holds good for Zen archers.They are also able to hit the target with 100% accuracy.This happens because once they see the target ,they transform their intention to hit it ,to the arrow and there is no way it will fail.
These analogies are quite interesting on how things can happen if one starts to believe in himself and live in the present.