I took Ryan Woodward's gesture drawing class spring term.
This class taught me how much I needed to loosen up with drawing. There was a big focus on exaggeration, and I don't think a pose was ever longer than 10 minutes, so these are all somewhere between 1-10 minutes. I think you can really see Ryan's influence, but in classes I like to implement--as best I can--the principles taught by the teacher, and then later try to fold it into my own style more. Don't know if that's the best strategy, but it works for me.