Making it to life drawing isn't always that easy especially when the classes don't line up with your schedule or you are broke. But there are websites out there that will allow you to practice from the privacy of your own studio for those times when you are stuck there.
These links lead to sites with nudity, so if you aren't supposed to be looking at it then please don't.
I went to Christina Wald's class at NKU last week and had a nice time- we were talking about drawing and gesture drawing and one of the students mentioned this website called Posemaniacs. I checked it out and it looks pretty useful!
There are timed poses that you can use to practice gesture drawing at home, and the figures are flayed so you can see their musculature. Also you are able to rotate the figure as needed to understand better why certain things look the way they do- and enable or disable a grid overlaying the image.
Line of Action
This site has a timed setting as well as the option to choose nude or clothed figures, and it also has a section on animals! The site is also working on getting enough donated to start a section based on practicing hands and feet, which would be great as well.
Figures for Drawing
This Tumblr page is updated multiple times a day and has reference divided into Male Reference, Female Reference, and Portrait Reference (Male and Female). You can also just view the main page and see it all together. These images aren't timed but they're well lit and the portraits focus on people with great expressions.