I've found that practicing gesture drawing really helps me improve the design of poses in my animation, and is very useful for planning my scenes. That, and I still just love drawing! I stumbled across this tutorial video from Mark McDonnell about warming up for gesture drawing, and I think there's some really useful information in here for animators. I especially like how he takes the live model's poses and changes them to make them clearer, and how he talks about the importance of energy over draftsmanship. Mark has a whole YouTube channel here.