Jo - Oh, the office chair! How I can relate.
I am in an office chair 8 - 12 hours a day (either at work or a combo of work and Planet stuff at home) and often feel by butt going to sleep because it's just getting pancaked flat in this chair.
One of the things I have been doing is putting my laptop on a tall shelf at the office or on the bar at home and standing part of the time. This allows me to do modified leg lifts while reading or typing and it definitely keeps my behind in better form.
In other news, EXERCISE REALLY DOES WORK. I have worked out more this week than I have in a while and pushed my intensity way up and when I sneaked a peak at the scales this morning, I was down another 5 pounds.
I know I wont always have weeks with big losses like that but Im definitely celebrating it when it happens. Once my weight loss slows down (and it will!) I will probably only weigh in every 2 weeks instead of every week.