The 27-year-old has been dogged by groin, hamstring and, most recently, thigh injuries since joining the Gunners from Borussia Dortmund at the start of last season.
Kolar explained: "Tomas has an imbalance of his musculature which, in my opinion, plays a big role in his injuries. Some of his muscles work more and are more developed whereas others are not.
"The problem is in the coordination of muscles which Tomas uses - muscles on the rear side of his thigh are enormously strained. It is a problem that stems from his childhood."
When asked if Rosicky's situation could be improved, Kolar replied: "Yes, but not in a week.
"It is a task for at least three to five months. But we cannot be so precise; it depends on how he reacts to the exercises.
"Tomas has to do various exercises in various positions. They are easy and will give Tomas the feeling he is exercising muscles he would not normally use."
"Tomas must do the exercises on his own. Perhaps it would be better if Arsenal knew about his problems but I can't solve this. It is Tomas's personal thing."