"It's probably the most intense training programme that I have been through to get in that kind of shape for 'Ram ji ki chaal'. It's well worth it now that I see it on screen," the 28-year-old said in a video of the making of the song.
"I am very happy that I looked like that at least once in my life and that it is imprinted on celluloid," he added.
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Deepika Padukone stars opposite Ranveer in this romantic action drama, directed by Sanjay Leela Bhansali.
Set in Gujarat, "Ramleela" also stars Gulshan Devaiah and hits theatres Nov 15.