Two terms that come up often when it comes to movement are flexion and extension. Understanding concepts like flexion versus extension can help you better understand the purpose of your workouts ...

Elliot Coues describes the peculiar movements made by the bones of the wing of the bird in flexion and extension. It may interest some of your readers to know that those movements were minutely ...

Decorticate posturing looks like ... For example, cerebral palsy may cause sustained flexion for extension of the extremities ...