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by Bjartr 3120 days ago
Walking[1] and supine[2] definitely exist. Neutral buoyancy almost exists[3].

[1] https://www.amazon.com/dp/B006M2PJV0/

[2] https://www.wired.com/2015/10/altwork-desk/

[3] http://www.thinkgeek.com/product/jtpo/