Mechanical contraction of veins in your lower legs from muscle contractions (walking generally, but could just be clenching) is what “pumps” that blood back to the heart. Once blood enters the capillaries, the blood pressure is quite low and not sufficient to return to the heart.
your legs are legitimately like a second heart. I was passing out because i just gave blood and had to sprint to the toilet and give some more. Well, on the toilet my vision started going grey. I’ve blacked out from low blood pressure 3 times in my life, I really didn’t want to do it on the toilet. I’m not pulling an Elvis. So i flexed all my leg muscles and (while sitting) kind of jogged my legs in place. It got the blood back up to my brain long enough for my capillaries and heart to catch up. if a dipshit like me can do it, so can you
your legs are legitimately like a second heart. I was passing out because i just gave blood and had to sprint to the toilet and give some more. Well, on the toilet my vision started going grey. I’ve blacked out from low blood pressure 3 times in my life, I really didn’t want to do it on the toilet. I’m not pulling an Elvis. So i flexed all my leg muscles and (while sitting) kind of jogged my legs in place. It got the blood back up to my brain long enough for my capillaries and heart to catch up. if a dipshit like me can do it, so can you