MUMBAI: Sachin Tendulkar has declared himself fit from the back problem that forced him to miss the fourth and last one-day international against Sri Lanka at Vishakhapatnam on February 17.

"It's fine", the batsman replied when queried about his 'stiff back' on the sidelines of a campaign to promote responsible sexual behaviour among young men of the country near his Bandra residence on Tuesday.

The campaign saw the launch of a series of street comics in Hindi that contains AIDS prevention messages.

The campaign is a joint venture of four NGOs - Population Council, Apnalaya (Mumbai), Divya Disha (Hyderabad), Prerana (Delhi) and CINI Asha (Kolkata).