<human>: Give me a shortened version of the text

Short backstory: I started my first ever desk job over the summer after having a fairly active job, and immediately felt HORRIBLE from all the sitting (and gained about 10lbs). I started requesting a standing desk in August, yadda yadda yadda, bureaucratic bullshit, about a month ago I finally brought in a bunch of (carefully measured and custom built) boxes and plopped my computer on those so I can stand at my desk. I stand 2/3 of any given work day, on average. I don't stand the whole day because my back starts to hurt.

Since I started using MFP, going to classes at the gym 3-5 times a week and standing I've lost about 12lbs. I don't really know if any of it is from standing at work since I started doing all three at roughly the same time.

Does anyone else have experience with standing at a computer? I've heard things about getting varicose veins from it. Does anyone know anything about that?
<bot>: I stand at my desk about 5 hours a day. Is that positive/negative/do other people have stories (success or otherwise) about standing desks?