[jodrellblank]

Did you consider a standing-mat?

"Standing on a hard floor for prolonged periods without anti-fatigue matting can cause pain and discomfort in the lower legs, feet and back." - some website selling them.

[mijustin]

Two things really helped me when I was transitioning to a standing desk:

1) a standing mat 2) a bar stool (for sitting and leaning when my feet get tired)