What the fuck man.
Ridiculous question.
At no point in our evolution was it designed for us to sit a long time. Your question has no answer.
ie, the answer is, what ever position works for you and doesn't kill you.
I'm sure others have mentioned standing. But... once again... we weren't designed to stand either.
We are an animal that was expected to be on the move at all times.
Standing will give you:
Varicose Veins
Popped capillaries
Edema
and still even the chance of DVT
Only thing that can be added, take daily aspirin, 80mg or so, to prevent the stroke you are going to get one day.
(My wife died from too much sitting. Literally. DVT behind her knee, broke off, went into lung, Pulmonary embolism
was a result. Upon surgery, part of the clot made its way to her brain. 3 blockages... coma. Few weeks later, and
I'm a widow. Extenuating circumstance? None that Dr would ever admit to. My consolation prize? Nearly 100 grand
in stuff the insurance wouldn't cover. )
-AI