I remember working with a woman who had been off work with flu and who was subsequently reprimanded on her return to work because she had been seen walking around her local area during her sick leave.
Her defence was that fresh air had been recommended and that the doctor had not certified her unfit to walk – just unfit to work. A point which was understood and grudgingly conceded.
A point which was less understood, (and not conceded) was the colleague who was off work with ‘chronic back problems’ but who had been seen at a bowling party day two of this chronic illness. Not stretchered in and put to lie quietly along a bowling lane so the poor thing could at least feel she was joining in, but rather her giving it large, bouncing around and, metaphorically speaking, sticking two fingers up to the system – or so said her disgruntled colleagues.