Yes, it could be a real story. There are many experiences in life where pain and gain are closely related. For example, athletes often endure a great deal of pain during training but gain excellent physical condition and the possibility of winning championships. However, without more context, it's hard to be completely sure if it specifically refers to a real story.
Definitely. The movie 'Pain and Gain' draws from actual incidents and characters. However, for cinematic purposes, some elements might have been dramatized or slightly modified.
It is. The movie takes elements from actual incidents and characters to create its storyline. However, some details might have been fictionalized for cinematic purposes.