How Many Minutes of Exercise Do You Need per Day?

Dr. Jennifer Ashton appears live on "GMA" to discuss a new study on the magic number of how many minutes of exercise you need per week to be healthy.
2:56 | 01/10/17

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Transcript for How Many Minutes of Exercise Do You Need per Day?
new exercise study revealing how much we really need to exercise, we need to do to see a benefit and Dr. Jennifer Ashton is back with us and, doctor, everybody is waiting for this. Tell us about this study. I feel like it's the academy awards and here is the winner. This is the actual study so let me set this up for you. It's long been recommended we need to do 150 minutes of moderate intensity exercise or 75 minutes of vigorous intensity exercise a week to stay healthy which means to avoid certain untoward health outcomes that we're all trying to avoid like death, which, you know, no one gets out of life alive but death, cancer, heart disease, this study right here actually looked at the weekend warrior group and those doing the three to five ties a week and good news for the weekend warrior, Michael. They're hanging in there. Everyone saw a benefit in what we call all cause mortality so that means death from everything from cancer to heart disease, even if you just get your sweat on on the weekends, so weekend warriors, rejoice. I always wonder am I working out too much. Am I not working out enough? Is there an exact -- You to get these guns? Well, you know. You made me blush. You can't see it at home but I really am blushing right now but how -- so you can be a weekend workout warrior so go during the week, maybe 30 minutes during the week and weekend you go hard ir. This is so difficult for so many people because so many people hate exercising because, "A," they might not see a benefit or result as quickly as they would like. We have to remember there are other reasons to exercise. Some people, I mean for me it's like I would be on a lot of, you know, bad things if I didn't get my stress release from -- Exercise like walking? It could be walking vigorously and by the way you don't have to get all that time in in one session like you mentioned. You can get it in in various parts of the day or week but, look, I'll temper the good news with this here because in my medical opinion, just, again, mind and body, more is better. Yeah. I really do believe that. I always say your body needs three things every day, it needs fuel, it needs rest and it needs to move and that newton's law a body in rest stays in rest a body stays in motion stays in motion. Why want to stay Mo motion. It's hard for a lot to get started. Do you agree, it's one of the hardest things to do. Do you have any suggestions? Here's my tip. Okay, number one, you have to like it, right? If you don't like it it's never going to be sustainable. Find something you actually like doing. If it involves any kind of movement, you're going to be getting some benefit and group fitness classes, they're so hot right now for a reason. Misery loves company. So you're all suffering together. It tends to go faster. When we get done you and I will walk around the studio to get exercise. Coming up -- thank you, doc.

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

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