Can you explain “easy speed” and how it translates to sprint events like the 50 free, 100 free?

Easy speed is a relaxed and sustained approach to racing that allows you to maintain your speed throughout the race. It's what sets great swimmers like Bruno Fratus apart from the rest, as he is able to accelerate near the end of his races.
 
Transcript: "Austin, this is a good one, man. I like this. This is in my wheelhouse. I just did a podcast with Andriy Govorov. And one of the things he described, spinning his wheels, he called it a Ferrari on ice-- not grabbing any water, not being able to hold any water, and just thrashing and just pulling, going too hard. Easy speed means it's relaxed speed. It's all-out speed with a relaxed mindset. And one of the things I learned from track athletes, if you look at the best track athletes in the world when they run the 100 meters, they've got a relaxed face. They're not tense in the face. They're not gritting their teeth, OK? They have a very relaxed face in the 100-meter final in the Olympics. You can see their cheeks jump up and down like this, OK, because they're so relaxed. So what I say to my athletes is relax your face, and go as fast as you can. And that's that easy speed. You want it to flow. You don't want it to be forced. You don't want to burn up that ATP, all right? You want to have sustained power, sustained energy throughout the race. Easy speed is crucial even in the 50. You see a lot of guys get to the 35-meter mark-- if you want to watch my race from the Sydney 2000 Olympics, you'll see a guy that burns out at the 35 pretty hard. That's me, man. So listen, easy speed's going to get you to the end of the race. It's one of the things that makes Bruno Fratus so good, is that he's able to maintain that speed throughout, and it almost feels like he's accelerating at the end of his races."