Mumbai- Superstar Salman Khan, who is known for his fit physique, says he has immense "respect" for Reliance Industries chairman Mukesh Ambani's youngest son Anant, who underwent a major weight loss session in just 18 months. The "Dabangg" actor, who is currently prepping for his upcoming actioner "Sultan", tweeted: "So happy to see Anant Ambani, lots of respect and so happy for him. Takes a lot of willpower to loose 108 kg in 18 months." The "Wanted" star also shared a selfie of himself along with the 21-year-old. In the photograph shared on the micro-blogging website, Salman is seen sporting a black shirt while Anant looks dapper in a black and white polo neck T-shirt. Even ace cricketer Mahendra Singh Dhoni earlier lauded Anant's "discipline and determination" over losing weight. Anant lost an average of six kgs every month – and that too, the natural way, an official said on Saturday. For this, like his illustrious family, he kept a ‘target’ – losing fat and getting absolutely fit by his 21st birthday, and achieved it. To stick to his commitment, he followed a strict regimen of zero-sugar, low-carb diet, along with adequate intake of fat and protein.