yes, most people would put it on the top 10 list of painful thingsA simple fracture is only moderately painful. A compound fracture[ bone sticking out of skin ] is very painful. A comminuted fracture...
You can break your leg by running down the stairs, make a wrong step, and if your not in that much of pain just pretend that you broke your or leg. Good Luck!!!
One way to break your leg is to jump from somewhere high with your knees straight and another is to get something heavy to fall on it and another way is to kick something hard.
You need to apply enough pressure to the bones in the arm to compromise the structure of the bone, causing the break. This will result in an extremely painful result.