What are anabolic androgenic steroids, and how do they affect the body?

This is the first of four videos about anabolic-androgenic steroids and how they affect the body.

Video 1: What are anabolic androgenic steroids?:
Video 2: Anabolic androgenic steroids – physical side effects:
Video 3: Anabolic androgenic gender specific side effects:
Video 4: Anabolic androgenic steroids – psychological side effects: