When people think cardio what's the first thing that usually comes to mind? Weight loss. Second is probably something like running a 5K or just being miserable. When you tell someone you want to lose weights what's usually the first thing you're going to hear? "You have to do more cardio!" Like it's the only thing to do to make yourself leaner.
In reality (yes I'm going to keep saying this) any kind of cardio doesn't have a major effect on fat loss. Yes there is some, but it's not what people expect. This is the same throughout any type of cardio wether it's steady state, high intensity intervals, sprint intervals, or low intensity. They all have about the same effect on fat loss and it's nothing to write home about.
So if fat loss isn't the point then what is? Do you even need to do cardio at all? What are the other benefits? To start off with, yes you still need to do cardio. It still plays a big roll in overall health and needs to be added into any exercise program in some fashion. So what is it good for?
1. Cardiovascular strength
Obviously this in the name, cardio helps build cardiovascular strength i.e. how strong your heart and lungs are. In an older post about predictors on how long you will live, I mentioned VO2max as the #2 predictor of longevity. You need to do cardio to be able to build that. Usually, for increasing VO2max, sprinting and HIIT will do more than steady state (because you're much closer to your max).
2. Increased recovery
When you do cardio, you start to develop more capillaries, which are the very ends in your veins and arteries that connect to the muscles. When you have more capillaries, your body can get nutrient to your muscles more efficiently. When you can do that, you will recover from workouts and heal faster.
3. Increased athletic performance
If you're trying to play any kind of sport at all, having a good aerobic (cardiovascular) base will help you play better and longer. Even if your sport is mostly anaerobic like volleyball, having a better base will help you recovery between plays and allow you to express your full anaerobic abilities for longer.
Obviously there are many more benefits, especially in the health field, but these are usually the ones I discuss most with clients. So just keep in mind, just doing more cardio or conditioning without making dietary changes will not help you lose weight but there are still good benefits of doing cardio. No matter your goal you should always keep it in your training program, at least a a minimum
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