I just stumbled upon a great tool for artists who don't want to get rusty at life drawing but don't have the time to attend classes o hire a model.
It's called GESTURE DRAWING PRACTICE TOOL
You are presented with a series of pictures of people posing. You can choose the length of exposition of each photo (30 seconds to 10 minutes), gender of the model or if you want them nude or fully clothed.
I just did these with photoshop.
There's a long way to go, but I think I am addicted to the thing.