I think Andersson is player example 1a of Sutter being shocked last year when arriving how most of the team wasn't in proper physical shape. Last year and bubble year he looked gassed often, noticeable because his play on a shift deteriorated that obviously. This year, none of that from what I've seen, so his fitness level has dramatically increased.
As far as skating technique, and any extra training and practice, you get out of it what you put into it. The confidence required to trust your skill level to skate like this, but then also your confidence in your ability to get back from a rush and not be gassed to play defense for another 45 seconds, is also important, so conditioning and technique and confidence goes hand in hand.
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