Bollywood megastar Amitabh Bachchan, who manages to keep fit at this age by regular exercise and yoga, recently revealed the secret behind his inspiration to keep fit while launching a book on nutrition and fitness.<br /> <br />At the event, the Big B said, "I am a bad eater. I don't follow any routine... I started going to the gym about five-six years back. I never used to do any kind of exercise. Most of the times when I was working on my earlier films, I never thought about it or I wasn't advised about it or perhaps I didn't have the time at all. But having seen some of my visuals on some of my films, I realized I needed to be in shape and started going to the gym on some kind of regular basis."<br /> <br />Bachchan will be next seen playing an amputee chess wizard in Bejoy Nambiar's Wazir, which also stars Farhan Akhtar and others.
