Wear compression stockings from ankle to thigh and pop an aspirin to thin your blood an hour before flight. These helped me as I'm at high risk.

Just get up and walk around every hour or two...

"just" is not the word to associate with "get up and walk around" on an airplane. Unless you have an aisle seat it's a notable hassle.

No, it's not. You say "pardon me" to your seat mate and they let you out or you climb over them.

That is the description of the hassle (skipping the parts where they are asleep, have drinks/food/laptops, etc). But if you feel better for denying any social anxiety or physical discomfort I or others feel while "climbing over" strangers periodically, don't let me stop you.

Aisle seats make up at least a third of all seats and don’t cost extra.

And they are my preference. But they aren't always available - per this topic, you're saying 2/3 of people have a harder time (despite the dismissive commentary from others) performing a routine task for their health.

It’s not a solution for the masses, but it works well for the individual.

Nah, screw your seatmates. If they didn't want to have to wake up every two hours they should have taken a window seat.

Even with that approach, I’m not sure there’s enough room for everyone to take the recommended stand breaks.