>>76732059
I typed some grug shit and only disgusted myself. For your blood pressure and circulation, what's important is how much blood comes out of your heart. If your heart fills more with blood, it can push the blood out with less effort and maintain the same blood pressure as when it works harder with less blood.
Your heart can adapt in two ways: it can expand to fill with more blood, and it can develop thicker walls to push out blood harder.
The high veinous return from genuine cardio tends to cause the former: your legs are a second heart pushing blood towards your heart, which stretches to cope with this. Weightlifting grinds tends to cause the latter: your body is so tight that it impairs your circulation and an enormously higher pressure is needed to get blood around, and your heart can only beat stronger to provide that.
Your body adapts to what you do, and so does your heart. Adaptation, especially unbalanced adaptation, can be bad in the long run. People who sit in chairs all the time get all kinds of health problems from the body getting too good at sitting in a chair and not as good at doing anything else. Saying that weightlifting is cardio because it raises your heart rate is like saying that sitting in an office chair is the same as sitting in a deep squat, because you're sitting in both cases.
