She tells The Hollywood Reporter, "I had to do 10 wall runs, where you run at the wall as hard as you can to get traction.
"I ran at it and my foot didn't go up, so I caught the wall with my stomach. My trainer thought I had burst my spleen.
"I had to get a CAT scan and go into a tube where they put this fiery liquid in your body."
Fortunately for Lawrence and her director, the young actress was only badly bruised and nothing was broken.