it's always really difficult for me to practice admittedly, but what i do is get images from pinterest and bring them into my art program. i lower the opacity on them and trace (yes, trace- it's fine to do for practice!) out the basic shapes of the figure afterwards. after i get the general idea, i replicate the pose with those shapes in mind on my own without tracing it out, and, hopefully, get a good end result out of it.
it also helps a lot to look at artbooks too! i especially like seeing how different artists apply anatomy to their characters, and it really helps with building up your own way of drawing figures.
(edit: speaking of figures, those are great references too. i don't find much use in the wooden posable figures, but action figures i have of my favorite characters really help in me in coming up with ideas for poses ^^)