I bought Henry Yan's Figure drawing book. And it came in today! Although it dosent really go through the construction, anatomy, and proportions of the body (I'd recomend Hampton for that), He does go over many little tips, techniques and tricks he uses to speed up the process.
Its a really good book with tons of examples and processes of his work. Check it out! http://www.parkablogs.com/category/tags/henry-yan
Here's a 20 min I tried from photo.