BBC
Bbc: Applied Anatomy and Physiology: Muscles and Movement
Learn what muscles are, how they are classified, and how they are attached to the body's skeletal system. This site contains several definitions, illustrations showing the parts of muscles, and a quiz to test your knowledge of muscles...
TeachEngineering
Teach Engineering: Walk, Run, Jump!
In this activity, students participate in a series of timed relay races using their skeletal muscles. The compare the movement of skeletal muscle and relate how engineers help astronauts exercise skeletal muscles in space.