The 67-year-old actor, who recently met world light-welterweight boxing champion Amir Khan, revealed that he used to box as a young man.
"Did I ever tell you that I boxed in school too? I think I did. In Boys' High School in Allahabad and then in Sherwood College, Nainital. Terrific sport," Bachchan posted on his blog Bigb.bigadda.com.
"The ladies do not much care for it. Too brutal for them they say, but such a lesson in life, that four cornered ring.
"Alone with an adversary, with nothing to defend yourself with except your own guile, strength and the will to fight. No external support and no avenues to escape. Just that roped square and the screams and encouragement from without."
He added: "When I was boarding the flight in London along came the compact figure of Amir Khan the renowned world boxing champ... who turned out to be an admirer of my films and brought along his family to where I was seated for a keepsake photograph.
"He is a perky fighter and I have witnessed several of his bouts on the TV. Full of spunk and great technique and speed, this little package of immense talent has been the pride of England, of which he is now a citizen."