Our good friend Buddy Scalera has been providing great resources to comic creators for years through his Comic Book School. One of those resources is a series of photo reference books for artists, and the latest volume of that series is out now!
Comic Artist's Essential Photo Reference: People and Poses features over 500 photos of poses that range from everyday activities to action shots.
You can get it at both Amazon and Barnes & Noble, and find out more about the book and the rest of the series at www.comicbookschool.com.