I stumbled onto an awesome website over the weekend called posemaniacs.com and it should become a part of every artist's toolkit. The site offers 30 second poses to draw from, along with a plethora of other choices. I just did 25 gestures this morning and I'm gonna do another 25 tomorrow... and the next day... and the next.
But don't take my word for it. Check it out for yourself. You'll be glad you did.