Jeanette posted some life drawing drawings on her Facebook page I asked her where she was getting the practice videos from. She told me she was using videos on Youtube, Croquis Cafe. Went to have a look and they are very useful You have at least a couple 1 minute poses, 2 minute poses, and then 5 minute poses.
I need more practice, but I have lots of time left in the summer to improve :)
And a 5 minute pose, with odd foreshortening which messed me up.