"Rock and a Hard Place" is a movie about people in a tough situation. It's like when you have to choose between two things that both seem bad. Imagine you have a chocolate cake and broccoli in front of you, but you're not allowed to have any cake until you finish your broccoli. You're stuck between a rock (the broccoli you don't like) and a hard place (not being able to have cake until you eat it).
In the movie, there are people who have done bad things and they have to choose between going to jail or going to a special program that's really hard. It's like being stuck between a rock (jail, which is bad) and a hard place (this tough program, which is also bad).
The people in the movie have to work really hard and follow strict rules in this program, but it's their chance to change their lives and avoid going to jail. It's like finishing your broccoli so you can finally have your cake.
In the end, some people make it through the program and some don't. But the movie shows that when you're stuck between a rock and a hard place, sometimes you have to make tough choices and work really hard to get through it.