"Mechanics" is a branch of engineering and physics that deals with forces and motion, and its fundamental principles apply to all objects, whether a bouncing ball, flowing stream, bicycle, or the human body. The field of "biomechanics" applies mechanics concepts specifically to the bodies of humans (and other animals). Understanding biomechanics is important for such careers as biomedical engineering, physical therapy and athletic training, orthopedic surgery, and prosthetics. Biomechanics can also help teach core mechanics concepts through the lens of anatomy and medicine--subjects many students can relate to more readily than to more traditional examples from automotive and aerospace engineering. In this lesson aligned with the "Next Generation Science Standards" (NGSS), students first learn about an object's balancing point, or center-of-mass (COM or CM). Students examine everyday objects to understand the unique features of COM and how to approximate and measure its location. Students then apply this knowledge to a real-world example of biomechanics: coaching a beginning diver to avoid hitting the diving board during flip dives.