What does the Abhidhamma say about impermanence?

I understand the state of changing (impermanence) mentioned in Buddhism, but I have also heard that another more complex version (of the doctrine of impermanence) exists in the Abhidhamma. I would also like to know about how impermanence work when it comes to the physical body? I would be thankful if someone could point to a few sources to learn about it, and maybe summarize it in an answer. Please mention if I can use this knowledge to my personal practice, and if it is possible then how to do that.