Upper arms, chest, waist, thighs, bum... I guess anywhere that you want to keep track of. Or just the waist.. doesn't matter too much, because hopefully you will know when you are happy with your body. Just don't let the measuring or weighing get in the way of appreciating your body always.

Sometimes when we are working really hard towards something it is nice to have measurable results. I think that's fine as long as long as we keep them in perspective.