General consensus is probably going to be something like WHO KNOWS MEN JUST DO IT!
But I started by attending some local lifedrawing classes (DO ITTTTTTTTTTTTT) and acquiring many helpful books that gave me things to think about and focus upon whilst attending said lifedrawing classes.
I reccomend the Force book (
http://www.drawingforce.com/) because it doesn't immediately vault into flexors and extensors and the latin names of finicky little bones, but starts with much, much broader concepts of anatomy, such as how to "see" where the force or weight is, how to see the forceful shapes, and how to actually start drawing. It's not necessarily an anatomy book in the technical sense, but I found it to be a lot of fun and improvement inducing.
Experience and failing a lot is always the best teacher, though. I'm extremely hypocritical on that front. I should go draw. RIGHT NOW.