Ive used PoseManiacs.com before when I needed help deciding poses, But I've never really looked into all of the features of the site until now xD
There is a 30 Second Drawing option. You can set the timer from 30 seconds - 90 seconds and it switches to a different model continuously. Simple but cool ^ u ^ ( http://www.posemaniacs.com/thirtysecond )
So you just draw as much of the pose as you can before it switches, and you'll get better over time.
I recommend quickly dotting or indicating all of the 'Key points' of the figure, and then using the rest of the time to shape it out.
I'm not very good at anatomy yet, so this is really helpful