I have lost a lot but so far my upper arms are still fairly firm. Only thing I can put that down to is the fact I Work out at a gym with weights 4 - 5 times a week and have been targeting triceps (back arms), quads (thighs) and lots of bench presses for the chest.. mind you, my chest is still vanishing at a terrifying rate lol!!! But seriously, my gym instructor told me the only way to tackle not getting saggy in those areas was to replace the fat with muscle and then that will only work if there is not much loose skin. If the skin has been overstretched then the only option at that point is surgery.