The meticulous star, who prepares extensively before taking up any project and thus ends up doing only one film a year, today said he found it difficult to juggle shooting 'Dhoom 3', 'Peekay' and doing research for his TV show 'Satyamev Jayate 2'.
Aamir, 48, and his wife Kiran's son Azad turned a year-old recently. The actor said he would take the child to his shootings so that he could spend more time with him.
The father-of-three said his youngest, Azad, born through surrogacy, has started going to play school now.
"We feel blessed to have Azad in our lives. His face lights up our life. Now he has started going to play school but earlier he would not let me leave for work and I would end up taking him on my shoots," he added.
"The physical training was really difficult. I had to have a lean but flexible body for my character of gymnast. I had only nine per cent of body fat while doing the film but got relaxed after I finished shooting.
"I remember when Adi asked me about beginning the shoot, I said, 'I will need a year'. He was surprised but now when he watches the film, he realises why I needed that time.