Unrelated to topic but I was in hospital recently and nurses came around to do vital,blood pressure oxygen temperature.i was having a high blood pressure. Often I lay with crossed legs but a nurse told me to uncross my legs and blood pressure went down. Why why cross legs increase blood pressure ?
Your blood vessels are a closed system. Imagine I fill a garden hose with water and cap it off at both ends, then kink the hose somewhere. Pressure will rise because it’s a closed system. It doesn’t matter if I kink it at one end or the other. Overall pressure will rise because I’ve removed some space somewhere.