To accept challenges is a way of life for bold and beautiful actress Mallika Sherawat, who believes that when someone stops doing so, he is "dead".

`The key to life is accepting challenges, once someone stops doing this, he's dead,` Mallika posted on Twitter Friday.

Mallika, who has featured in movies like "Pyaar Ke Side Effects" and "Murder", was last seen on TV reality show "Bachelorette India - Mere Khayalon Ki Mallika".