Your VO₂ max isn't just genetics and training. A stiff upper back restricts deep breathing and oxygen intake. Improving trunk mobility and breathing control lets your lungs expand more, boosting the oxygen available to your body.
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VO2 max is it's not just about training your body to work hard. Some of it's genetic, some of it's training, and some of it is mechanic. And we don't realize that a stiff upper back is one of the reasons why you can't take a big breath. So one of the things that we're working on with this breathing, for example, for mobilizing the trunk, is looking at, do you have control all the way in of your breath and all the way out of your breath? And does the trunk move in that system that way? Can I expand maximally? Can I contract maximally? The more efficiently we can get air in and out of the system, we can start to see that your body can actually have access to more oxygen.