Dynamic compression to increase venous flow from the legs

 https://youtu.be/pbaVvKsAkZQ 

https://spryngme.com/products/spryng 

https://www.amazon.fr/Massage-Appareil-Pressoth%C3%A9rapie-Relaxant-Amincissant/dp/B08G51SJ9C/ref=sr_1_28?__mk_fr_FR=%C3%85M%C3%85%C5%BD%C3%95%C3%91&crid=327OM9Q2XZCQQ&keywords=Appareil+de+Massage+Jambes+compression&qid=1656602233&s=hpc&sprefix=appareil+de+massage+jambes+compression%2Chpc%2C68&sr=1-28 

1/ is compression of the thighs useful?

2/ is walking during the compression period efficient

3/ is a battery mandatory?