I've brought a hot water bottle into work today and I've had it on my back all day whilst sitting in my chair at my desk. Wow it's amazing, I'm no longer freezing to death!!! Should have thought of this ages ago. It really does make a difference, especially when I'm having my 1st (lunch time) shake and then my 2nd (4pm) shake, they normally make me feel cold because I have the water in the shaker in the fridge so the hot water bottle has made a massive difference.