Facing the camera for his soon-to-be-released biopic has been more challenging than standing up to the fastest bowlers in the world and scoring runs, said cricket icon Sachin Tendulkar at Mumbai on Thursday.

"For so many years, I did whatever I wanted to do and the camera captured that. Suddenly I was asked to do particular things and then the camera captured that, so it was a bit different for me. Believe me, the first option was better," said Tendulkar in Mumbai at a function, where he was announced as the face of the inaugural IDBI Federal Life Insurance Mumbai Half Marathon, scheduled to be held on August 21.

"Acting is not something that I dreamt of. Without any doubt, acting was more challenging than playing cricket. I enjoyed playing more," added Tendulkar, who played 200 Test matches before retiring in November 2013.

Tendulkar, 42, is making his acting debut with the biopic, 'Sachin: A Billion Dreams', which has been directed by award-winning British director James Erskine.

The former India skipper, who was also announced as the face of other half marathons -- Delhi and Kolkata -- by the life insurance firm, hailed the long distance runners, some of whom were present on the occasion.

"I would like to congratulate you all. I fully understand the sacrifices you make. In marathon every second matters. It comes once a while for which you prepare yourself, control your diet, push each other in a healthy competition. Healthy competition brings out the best results.

"If you lead a healthy lifestyle overall the result is better. You are able to achieve your target whether you are a doctor, engineer or sportsman. My grandmother used to say health is your real wealth, so look after your health. By running if you can keep yourself fit, then why not (run)."

He also recalled his younger days when his coach Ramakant Achrekar made him train and play from morning till dusk.