Los Angeles, Sep 10 (IANS): Actress Jessica Biel, who is engaged to Justin Timberlake, taught by her father how to deal with extreme conditions, and knows how to stop hypothermia developing.

"My father taught me to be a survival expert. I know how to prevent hypothermia if you fall into a freezing cold river; you get out and immediately take off your clothes," contactmusic.com quoted Biel as saying.

"The best way to heat up your body is to have skin-on-skin contact with someone. So basically, you're both naked," she added.

The 30-year-old credits her parents as the closest people too her in her life, mostly because of their outdoorsy nature.

"Who have I been closest to in my life? My parents. They are very cool outdoorsy people. Growing up, we always camped as a family in Colorado, where we lived.

"My dad taught me all this survival stuff, like starting a fire and building a shelter out of trees and branches. We are a very close-knit family," she said.