Muscles in Motion: Figure Drawing for the Comic Book Artist -  Glenn Fabry - 144 pages. 
Comic-book artists are constantly on the lookout for sources for creating those super-human muscles, and now MUSCLES IN MOTION is ready to heed their cry for help. While most anatomy and life-drawing books focus on average bodies, MUSCLES IN MOTION looks at the musculature of bodybuilders and athletes, and then builds on those physiques to create exaggerated forms that are still strikingly dynamic and realistic. With more than 800 action drawings taken directly from the sketchbooks of legendary artist Glenn Fabry, plus Fabry's remarkable commentary on those drawings, this is the single best book on action anatomy for comic-book artists, beginning, intermediate, and advanced.