Ok, I had been wondering why the Apple Watch was not giving me credit for standing up when I was. I narrowed it down to when I was holding my coffee in the watch hand. Odd? Yes.... 100% of the time if my watch arm was at a 90 degree angle I did not receive credit. Ok grey matter kicked in, yesterday and today when I got the stand up alert and I was sitting I did not stand, I let my arm hang down over the arm of the chair. I got standing credit while sitting, every time. In fact the watch has 0 clue if you stand, it only knows if your arm is hanging down towards the floor. For all of you unlucky sods that hold a book, notebook, drink, paper, anything in your watch hand, you will not get standing credit, you may even get asked to stand even though you are already standing.