Megastar Amitabh Bachchan has accepted Union Minister Rajyavardhan Singh Rathore's online fitness dare. The initiative, called the 'Hum Fit Toh India Fit' challenge, was started by the sports minister, who posted a short video of himself doing pushups few days ago. The 75-year-old actor took to Twitter to accept the challenge. "@Ra_THORe we accept the challenge of #HumFitTohIndiaFit #FitnessChallenge... Main mantra: BE CONTINUOUSLY MOBILE... "Get up for every errand yourself, gym each day, push away that excess morsel of temptation, drive or cycle yourself, see the sun more often," Bachchan wrote, describing his fitness routine. Rathore called on actor Hrithik Roshan, Indian cricket skipper Virat Kohli and badminton champion Saina Nehwal to join the campaign.