Can Your 'Fitness Age' Indicate Longevity?

Norwegian researchers find your "fitness age" is a better predictor of lifespan than chronological age.
4:04 | 10/16/14

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Transcript for Can Your 'Fitness Age' Indicate Longevity?
To the heat index. And a storying big overnight, the fitness age and what it can do for your future health. This can be lower or high than your actual age. Depends on your cardiovascular endurance. You can boost it by exercising. A 50-year-old man can be between 30 and 75. And testing involves checking your heart rate, waist circ circumferen circumference, on a treadmill. I took it yesterday. How would are you? Not as young as you, in my low 30s. In your 30s. It's all about the exercise. Have you always been this consistent about your exercise? You have been since being here. A long time. Good for you. And the cardiovascular, is that really the most important part of it? It seems like it, that and waist size. What's your workout routine? A lot of different things. It's coming up in one word -- jazzercise. Oh, Lara Spencer. I'm sorry, George. Also this morning, you ever -- I hadn't heard of this, cuffing season. It turns out it's a time of year when many people started wishing they had a significant other, someone to be cuffed to as the temperatures drop and invitati invitations to holiday events start flowing in. No definitive data confirming cuffing season, but people tend to couple up during the colder months. Part of it is to do with evolution. And yeah, it's cold. Cuddle up. Stuck inside, better to be stuck with someone. Football game -- And you're less likely to meet somebody new during cold months because you don't go outside that much. Isn't it ironic, it's the season you want to be cuffed. And it's harder to meet people. It's called the internet. Bring people together in colder months. Online date. We're so many things. All right, now -- next in the heat index, Tony Reali has a fast-climbing story that has us talking. He's in the social square with it. What's going on? Good morning. So much trending on the internet that wants you to say yes. The power of no. Two go to the big screen. Jared Leto on the cover of "Fast company", revealing how no has been crucial to his success. Critical career decisions, sometimes said yes, and others turned down. The greatest example, he turned down the role in "Dallas buyers club," several times. That's the role that eventually garnered him the academy award. He wanted to concentrate on his muk with his band 30 seconds to Mars. We all want to say yes, because with yes comes so much opportunity. But with the power of no comes focus and engagement. That's deep. It makes me want to know more. He said no many times, but he said yes. Our question this morning, what's harder to say, yes or no. Tweet us, #socialsquare. The power of no. What do you think? I think it's brilliant. We have talked about it off-camera a great deal. Being selective and smart. And you feel blessed and have the opportunities. Don't want to say no, you're not being grateful. But you need to prioritize. As women, and we were talking about this, we feel like we have an excuse. What do I say? No is a complete sentence. No is a complete sentence. Don't is say no and then explain yourself. I use the advice. It's hard for me to say no. I'll be honest. And I think of you every time, robin says it's a complete sentence. That's a gender -- He doesn't have a problem with it. Hey, thank you. Thank you very much.

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

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