Actually Greeks and Romans too were familiar with martial arts, at least some forms of wrestling and boxing. Unsure about dietary habits though I suspect nothing too complex.
And well regarding samurai diet like I said, they were nobles and they could afford all that food. Still surprisingly they were lot like western knights with bushido/chivalry code, both knights and samurai fighting on horses (though samurai used bows, knights saw ranged weapons dishonorable) oh and of course both are noble caste. Not to say that aren't differences but samurai are lot more romanticized because they are exotic. Oh and don't really know if meditation was factor since that is more mainland asia thing. Asian cultures aren't one singular thing.
Well vikings were definitely more organized then we give them credit. Though always thought it was first and foremost their naval capabilities that gave them the edge. As for drinking well seriously it is easier to list cultures that aren't alcoholic.