"The Legs Feed The Wolf"
If you don't understand the phrase, it simply means that a player would need to be capable of great bursts of speed and for long periods of time. When wolves hunt, they use explosive speed and are able to outlast their prey.
The basic idea to take away is that if you can't run after the ball or outplayed your opponent then how would you expect to win a match, the legs needs to build up so it can last not only for the whole match but for the whole tournament periods.
One of the most memorable Coach Herb Brooks quote:-
“Red line, back. Blue line, back. Far blue line, back. Far red line, back. And you have 45 seconds to do it. Get used to this drill. You’ll be doing it *a lot*. Why? Because the legs feed the wolf, gentlemen. I can’t promise you we’ll be the best team at Lake Placid next February. But we will be the best conditioned. That I can promise you.”
For that, the US Ice Hockey Team won gold in 1980 Winter Olympic at Lake Placid, Canada. They were the underdogs at that time.
Obviously, legs and hips are important in elite level sports, or any level sports for that matter. But Herb’s advice should be a guide for everyone to follow. It appears that strong legs KEEP YOU ALIVE!