For several months, I practiced life and gesture drawing to improve my understanding of human poses. I would start by warming up with loose gestures, 25 seconds each, then 1 minute each, then some 5 minutes each. After that, I'd get right into replicating a pose in a way that is slightly exaggerated for appeal but remained anatomically believable. (I also ended up doing some with some crazy exaggerated proportions for fun.)
All drawings done with pencil on paper and collaged digitally.