Alien Bodies is a story about people who are kidnapped by a mysterious scientist and have their conciousness placed into an android body. These android bodies can be as lifelike as their creator wants them to be. Many "subjects" will not realize their artificial nature, and simply assume they have been transformed or placed into another human body.
The scientist often allows his subjects to easily "escape"; it can be assumed he/she/it is constantly monitoring his victims for either legitimate study or more perverse reasons.
The android bodies themselves are quite strong and resilient; assume that even the smallest and most fragile-seeming bodies are at least able to press 200 lbs. or so. Nanites will rapidly repair any physical damage, and the bodies are practically immune to being punched, kicked, shot, hit by cars, and the like. Only edged or piercing attacks will be able to inflict serious harm. You get the idea.
The bodies no doubt have hardwired commands as well, preventing the subjects from doing anything stupid that would cause serious damage or destruction, attacking the scientist, etc.
Not all the android bodies need be human, if you want your character to be a six-armed, 9' tall catgirl...have at it!
But I'm operating under the assumption that the individual who creates the androids likes pretty female types...