"We Indians mature late physically. Do not push your muscles at young age because (Boris) Becker did it or someone else did it. The best period for an Indian player is 25 and 32. This is the period an Indian is physically strong enough to take huge load of work but for the rest of players in the world it is about 18 to 26," Amritraj said.
"For a female, it is little bit more. For example, Sania is 22. Now is the best chance for Sania to improve upon her results and ranking for another five or six years to do what she need to do and work harder without getting hurt," he added.
Asked reasons for Sania's injury prone nature, Amritraj said it was because she had put in extra effort at young age.
"At a young age, I think she puts in a lot of efforts. So, injury come fast and fury. You think you have been playing well and working harder but suddenly when injuries come you had it," he said.
"(Roger) Federer reached the top of the peak at 26. For an Indian that will be the time that he has to be hitting at it," he said.