Nik Wallenda prepares for death-defying stunt

The 40-year-old daredevil is slated to walk on a tightrope across Times Square on Sunday.
3:08 | 06/20/19

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Transcript for Nik Wallenda prepares for death-defying stunt
Our "Gma" cover story. High-wire daredevil NIK Wallenda is getting ready to take on his challenge high above times square. Michael is there and Michael will try a feat that we -- oh, maybe just going to stand there with NIK. We'll let you decide. You're throwing that to me, David? I think I hear you said Michael is going to try something? Is that right? Yeah. What do you got? Okay, I can barely hear you. I'm here with NIK Wallenda 17 stories above times square right now with NIK and his sister they will walk across this alowemer on this Sunday and do it at the same time and will have to cross in the middle. Thank you, first of all for joining us and the per tech tiff is different than looking at that wire from down below. A little intimidating. Lijana will start hire. You're going to start at that end. That's right. Of times square. One of the challenges we have, we're at 17 stories here but 25 stories there so as you can imagine -- The wire isn't exactly straight and it looks -- that's a challenge? A little steeper than I expected. I have to walk down that incline and the concern is just like walking up Orr down stairs. You're walking down of stair, it's further away. Extremely intimidating for sure. This is a big walk because not so long ago big accident, your sister lijana had to fight back physically and mentally to where she is now and you too. What is the biggest challenge, the physical aspect and mental -- The physical aspect we've done for way long time. My sister hadn't been on the wire for two years. This will be her first performance since that accident. There is that physical aspect that she hasn't been on the wire for a long time and the mental after an accident I suffered challenges of reliving that accident. I didn't fall 40 feet. She's the one that fell. I have concerns that I don't know that she'll take that first I know my family blood says never give up. It is a serious concern. I came up for the first time in three nights rigging these stabilizers and it's pretty intimidating to me and, again, I didn't fall 40 feet. What she is having to overcome is almost impossible and I've done this my entire life. Over double anything she's ever attempted before and longest by over quadruple than anything she's done before again coming back from a bad accident. I want to -- you're a brave man. We look forward to watching you on Sunday. Myself and Erin Andrews will host "High-wire" with NIK Wallenda. Tune in. I'm getting down, okay. We all get a chance to let

This transcript has been automatically generated and may not be 100% accurate.

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