The Hollywood superstar insists he learns martial arts and keeps in amazing shape purely to protect his family - and know he will survive a crisis.
"If the [bleep] hits the fan, you can get out of the [bleep]," the actor told Men's Fitness magazine in the US.
Demi Moore's husband also says preparedness for the worst is the main reason he is still learning the Israeli fighting technique krav maga, which he used for his role in Killers.
"All of my physical fitness regimen is completely tailored around the end of day," Kutcher said.
He also practises Bikram yoga and jogs up LA's Runyon Canyon to work out.
"I stay fit for no other reason than to save the people I care about."