How Do You Shuffle the Deck of Cards?

In the world championship, in other memory championships, you get a deck of cards with 52 cards. If this is shuffled, you don't know the order of the cards. And then you have time, as much as you want, maximum five minutes, to memorize this specific order which is presented to you. The world record right now in doing that, memorizing, just the memorizing part, is around ten seconds. But i think with techniques and e and a bit of training, every one, or most of the people out there, would be able to do that in five minutes,. It's just technique and that's possible. Bfor almost everyone.