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	Andy Roddick's 150-mph serve is second to none right now.

Michael Weiss, figure skating
"The speed at which they're serving tennis balls now is pretty crazy. I remember when 110 mph was really fast. Now it's 150 mph. That's pretty impressive. I (can't imagine) even being able to see the ball go by, let alone getting my racket on it. A pitch might be 100 mph in baseball. A slap shot gets up to 105 mph in hockey. But taking that next step to 160 -- that's about as fast as anything in sports is going right now. Unless it's on wheels and driving."

Do not try this at home unless you're Zinedine Zidane, of course.

Steve Nash, guard, Dallas Mavericks
"Everything Zinedine Zidane does with a football (soccer ball). You can't really articulate the way he dribbles or the control and power he has when he shoots or passes, but I love to watch him play. Some of the goals on his DVD (a Zidane biography) are absolutely ridiculous."

Degree of Difficulty

Check out more Page 2 content: WHAT IS THIS? Check out Jim Caple's essay BRACKETS Vote: Best male athlete in the world Vote: Best female athlete in the world THE BIG GRID THE BIG GRID Sports Skills Difficulty Rankings Boxing: Down for the count? Basketball: Underrated or overrated? THE ATHLETES SPEAK Why is your sport most difficult? Hardest thing in your sport? Best all-around athlete in your sport? Most impressive feat you've seen? Coming up: Hardest thing to do in sports? And more ... PAGE 2 TRIES ... To hit a major-league fastball The modern pentathlon Riding the waves on a surfboard Coming up: Water polo ... and a surprise LISTS Greatest feats of athleticism Greatest all-around athletes ever Coming up: Feats we'd like to see

Tony Kanaan, Indy Car driver
"It's tough to talk about other sports because I don't do them. But again, I think people who do their sport day after day after day and have the motivation the do it well every time -- I think that is the biggest thing. I appreciate people like Michael Jordon and Michael Schumacher. They've accomplished so much in their lives, but they still have the motivation. It's really easy, when you accomplish something, to lose the motivation. I think it's hard to wake up every day and work at your sport. If you're going to be the best in a sport you play every day, you basically don't have a life. That's really hard and that is why some people stand out more than the others. It's a combination of talent and perseverance."

Dany Heatley's coordination is a thing of beauty.

Tony Gwynn, former outfielder, San Diego Padres; coach, San Diego State University; ESPN baseball analyst
"Taking the handoff and hitting the hole for a running back. It takes vision, speed and toughness, not to mention that there are 11 guys chasing you. And throwing a perfect spiral downfield has to be up there, as well. I played basketball and I know how tough that is, but being outmanned as a ballcarrier has to be the hardest. But handling a puck on ice with that long stick must be difficult, too."

	How can you not be impressed?

Chad Senior, modern pentathlon (sixth in 2000 Olympics)
"It could be not getting hurt in football. Someone like Brett Favre -- that's probably a hell of a feat. But what Lance Armstrong is doing is ... I don't know how someone can do something more impressive than that. That's pretty damn good. Not only is he outclassing everyone, he's beaten them all and he's doing it year after year. And to suffer that much. I think what impresses me most about it, what a lot of people might not think about, is the motivation to train in the offseason, to ride your bike up a freakin' mountain, and to continue to have that desire. I don't know how he does it. That part is the most impressive for me. And the last, I'd say, is Al Oerter winning four consecutive gold medals in the Olympics. I don't think we'll ever see that again. Unbelievable. And most people have never heard his name."