Available USA only.
Lifehacker recommends …
Most fitness apps for iOS will teach you to stretch and exercise through specific demonstrations, but iMuscle takes it a step further by actually showing you the muscles in action.
It works by providing a ton of animated diagrams that are accessible with just a touch. When you launch the app, you just grope the part of the muscular body you want to work on and it’ll stick a few pins in it. Each pin corresponds to a muscle (or muscle group) and its associated exercises and stretches. Touching any of the exercises or stretches will provide you with an animated demonstration, written instructions, and pictures of the affected muscles. …
iMuscle Teaches You to Stretch and Exercise by Literally Showing You the Muscles in Action
If you like that, check out similar apps for the Skeletal System and Muscular System.
Thanks for the link, Warren.
Gymnastics Coaching.com 