Locate some X-ray films of fractured bones. Talk a local physican or radiologist out of some X-ray films showing normal and broken bones. Or perhaps an anatomist at your school might have a set. The features of X-ray films show up fairly well using an overhead projector in a darkened classroom. Describe to your students the nature of the injuries leading to the break and the steps a physician might have to take to set them.
The rate at which fractured bones heal depends somewhat on the nature of the break and on which bone is broken. The long bones of the legs generally take longer to heal than the long bones of the arms. Bone fractures heal much more rapidly when the broken ends of the bones are close together, which is the goal of the physician in setting the bones. As a person ages, it takes longer for fractures to heal.
Have an exercise trainer come to your classroom and talk with students about the proper, and improper, ways to build and tone muscles. Ask that person to provide demonstrations and have student volunteers participate if possible. Emphasize the key groups of leg and arm muscles that work together and that produce antagonistic movements.