One of the most effective ways to improve your figure #drawing, proportion, posing and gestures is to do quicksketches. They range from 30s to 2min, giving you no time for details. All you can put down is the essence of the pose.
#Ink is especially useful here since there's no erasing, so you learn to make confident marks and get it right the first time. Quickposes.com (nsfw) is a good site.
These were 60s each