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John Schriffen's Big Shoes to Fill Video We want to get here. Five days, now, and counting, until robin is right here at the desk. Another step on her journey, being walked, or really run and jumped by abc's john schriffen. He is playing in the nba allstar game in houston, where robin had hopes to do it. And to make sure he does our allstar and hall of famer proud, john's been getting tips from some of your favorite celebrities, alltime great players and favorite person. Reporter: Valentino Flat Sandals It's a daunting challenge to stand in for one of the game's true greats. I am working hard to make my comeback soon, too. I am bummed that I can't be there at the game. But john is there. And, john, you're going to score some points for me, right? I'm counting on you. Valentino Rockstud Slingback Pumps Reporter: Thanks, robin. I will try my best tonight. But I can't wait to see your comeback on wednesday. I've been drawing the help of nba legends. Among them, clyde drexler. Bruce bowen. Bruce playing against me. And both have volunteered to help me get ready. Most guys they do an nba workout in 15 minutes, they're deadtired. Reporter: This could be it for me. Bruce and clyde, along with chandler parsons, know something about staying fit. They are ambassadors, encouraging children to be active. We have to focus on kids getting outdoors more. There's the ball. Reporter: Also about me not embarrassing robin in tonight's celebrity allstar game. The ball slipped. Reporter: I'll blame it on the ball. Thank you. Thank you. We're going to work on it. And tomorrow night, we're going to do it in the game. The ball didn't slip. He's worried about playing my team. Reporter: Maybe I can't dunk like chandler. But I do have a secret weapon. High school basketball coach lawrence roberts. Did I mention he's robin's older brother? I have to make robin proud. Listen, here's what you need to do. Shoot the ball. Shoot the ball. Shoot the ball. Did I say shoot the ball? Reporter: Valentino Pumps Stud Give me one or two goto moves. There you go. Nice. Reporter: I like this. All right. Reporter: This is going to work tonight? Absolutely. Reporter: Let the game begin. For "good morning america," john schriffen, abc news, houston. One, two, three. Team robin. That's awesome. Bruce bowen, my former colleague at espn, he's going to be jawing all game. You can see it. The celebrity game tonight at 7:00 eastern, on espn. Enjoy. This transcript has been automatically generated and may not be 100% accurate.

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