Why can't you cross your legs?

Another bad habit. One of the causes of varicose veins. It would seem an innocent thing, but every day talking with phlebologists (specialists in vein diseases), I understand that such an innocent habit undermines the health of many people's legs day after day. This causes pain in the lower part of the spine, interferes with blood circulation, and can even lead to diseases in the pelvic and genital area. For example, the scheme: a normal vein and with varicose veins, the arrows show the blood flow, normally in the veins it is carried out from the bottom up.