Whilst my normal workplace has a large enough galley area to allow for stretching exercises, I'll admit to wearing 'flight socks' now for all the long sectors (trans-atlantic)...they come in an anonymous black colour, and are not uncomfortable.
Asprin...I'm aware that it can and does cause problems with stomach linings. There is a 'smart' asprin called Clopidogrel that does the same job - only better. I think it's probably an AME issue drug?