Proko @ Youtube is a goldmine of info for studying anatomy, I'll always rec him to anyone asking for anatomy advice. There's a lot there but the videos are short (the longest is 15 mins) and only focuses on specific muscle groups telling you how it moves, what it moves and looks tensed/relaxed. Some of the humor is grating but it's worth baring with because it is such a good resource for leaning anatomy. He also gives exercises you can do as "homework" at the end of each lesson.
Good luck!