bring a ball and try to balance on it? haha
honestly I have no clue... short of actually taking like 5 min breaks every other hour to do some type of exercise (push ups, etc) I don't see how much can be done just standing. People take cig breaks almost every hour where I work so I don't see how you taking a small breather from work should be much different. That's what I said to my boss when confronted, since we work with a heavy smoker and nobody says shit to him. I told my boss if it was okay for my coworker to smoke one every hour it should be okay for me to take a fresh-air break just as often. I don't even do it as often which is why it kind of bothered me when he asked me why.
I hate my job though, sorry for the tangent.