Iphone 5: App to weigh myelf?

I want to keep track of my weight. Is there an app for iphone, to weigh myself daily, and document it? I wonder, if that could break the iphone? IIm not that heavy, but if there's a weigh limit to the app, please tell me.

Do you think you are going to stand on your phone?

There's no device that can support over 50 pounds. Nor does any phone have the correct sensors to measure this. Btw I knew you owned an iphone before you even said it, often times your intelligence reflects onto what ever device you own…

No phone, that I know off, has the capabilities to weigh a person. There are, however, "smart scales'' that link to various apps.

No phone would have an app that makes it a scale.