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How can I deal with standing for long periods?
I have an odd sensation, like pins and needles
The technical name for that kind of altered sensation is paraesthesia. It can have a number of causes; so much so that if you are getting this and it's bothering you the usual response applies: go and seek medical advice.
On the other hand, if you are still a bit ...
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Veins pop out when the muscles are strained.
https://www.scientificamerican.com/article/why-do-veins-pop-out-when/
Muscle builders try to get them popping out with constraining the blood flow by tying something to their arms. The compression socks and pantyhose may work in a similar way.
http://www.wikihow.com/Get-Veins-to-Pop-Out
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Aren't you in luck, I asked a very similar question over in physical fitness SE:
https://fitness.stackexchange.com/questions/31109/how-effective-are-standing-desks
Here is the top answer:
A recent meta-analysis of 23 published studies is MacEwen, MacDonald,
and Burr, "A systematic review of standing and treadmill desks in the
workplace," ...
Only top voted, non community-wiki answers of a minimum length are eligible