@carnage4life

I went for an ultrasound because of concerns about Deep Vein Thrombosis - which contributed to my mother's death - and got some of the best advice I've heard, to wit:

Don't do *anything* for more than maybe two hours straight. Not sitting not standing. After an hour or so, take 10 minutes and move around. Walk, exercise, whatever. Get the blood flowing.

Seems legit.