61-year-old CEO shares his tips for staying fit at any age

Take-Two Interactive chief Strauss Zelnick now sharing his 90-day plan to jumpstart your health and fitness in his new book.
4:22 | 09/03/18

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Transcript for 61-year-old CEO shares his tips for staying fit at any age
As summer ends and we get back to business many of us are king about kick-starting our health and fitness for iration chk this guy. He is 61 years and clearly -- O way. He is a good friend of mine out with a new book about how we C the best spe of our lives anyhile still eating a little bitf ice crm. Eck it out 6:00.m. In midtown tan. Comeup. Reporter: These mostly 20 somethgs are grinding it out in a nearly hour-long boot camp. Two, one. Orter: Rig there in T thing of things that G is a 61-year-old. Prm in 2012 as a to transform his relationship W Last time, best time. Reporter: The crew trains healthy only is Zelnick ripped ugh toave graced the cover of en'sfitness" C E two interactivech ow such hits grand theft auto. Now he sng his90-day plan tojumpta your heath and in new book becoming gels the four secretso looking an feeng younger than ever. The Pilla is exercise. What I suggene take a walk for 15utes and then two days aeek for 1 min let'sdd T push-uefore the Slowly is a he principle.what are the other big ones. Eatinogram thats smart and sensible and Dr aroved that will give you more , make you more healthy and actual cause you to lose Weig Ian say I your defense this mans ice cream. I do. Of myigtakeaways, I ne doctor haveropriatescenings. That I part of LG gond the final piece is develop some spiritual life. Tank I a togethers a holistic approa. Age Wil no longer define you. If I could keep up with him E though he's nearly ears older I agreed to hit the gym with him. Why a my so much lighte here we go. Looking good. Kind . Just two more times. I could it 15 times. Oh,good. Ook at his biceps look at his. It's odd harder the fourth time in Reporter: 28 minutes I I was as I entered the later stages of MI 3-year-old E best Sha of my life. In do you thinkou be able to do it.life looks like it D no sure. I have work to do. All right. Here's the C thing. That was Strauss' third T of THA day. Of the day? Of theday. He doesn't do that day. Just B we were following him around with a came he's able T -- he's so fit he could do it even thought'is third. When some might S weak this is actually what we see, Dan. We see strength and we Yes. With"rocky" played in the background.what did Y call ur Python. Python right here. I was going to say iw we wereff to a good start when you cald the kettlebell a bell. This is going to be a great workout, folks. I'm not that. Do you actually know how T use these. I didn't until I W out withstrauss. You're hdingt with one hand. Whs the apppriate -- askauss. I have to say,he fact that he's 61 and thatfie has -- and we are he'seen the single biggest uence on myhealth es of anybody I've ever met that F 61, we can do it at age. Those pythons, hard to live up to. That's right. We'll Brit back. Keep it here. Go

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

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