Newly healthy country star Willie Nelson has taken up jogging at the age of 74, in a bid to stay fit. The life-long marijuana smoker recently kicked the drug and he has taken up exercise to boost his life expectancy. He tells, "I have started running. What I was trying to do was do at least as much good in the daytime as I was destroying in the nighttime. But it got to the point where I was losing ground. "I had to start trying to stay alive or I was going to die. So I've had to give up the smoking and drinking. And when I quit that and started running, I got a lot healthier."