Here's a helpful essay on the movie:
However, it was during this dark period that Milkha discovered his passion for running. He joined the Indian Army, where he was encouraged to develop his athletic skills. With the guidance of his coach, Havildar Tejinder Singh, Milkha began to train rigorously, and his natural talent soon became apparent. Bhag Milkha Bhag Filmyzilla
The film's release also sparked a renewed interest in Milkha Singh's life, with the athlete becoming an icon and a role model for many. He continued to be involved in various sports initiatives and remained an important figure in Indian athletics until his passing in 2021. Bhaag Milkha Bhaag on Filmyzilla: Why You Should