Here are some foreshortened exercises from my storyboarding class.
Ideally, you should be able to tell the foreshortened drawing from the realistic version. If not, I failed.
It was an experiment on how far we could push perspective until we break it or the figure, avoiding the unbelievable. A lot of times you'll have to change the pose around because humans just don't bend that way. And that's perfectly fine.
I challenge you, take a pose then draw both a realistic and exaggerated version!
You can find the male figure on characterdesigns.com and the female somewhere on DeviantArt. I didn't keep track of that at the time. I know both probably can be found here: Pixel Lovely