I took Life Drawing again last year as an elective module. I really enjoyed it - it teaches you so much and allows you to become more versatile.
I like the fact that you can use whatever medium you like, you get stuck in a rut with something you're used to, pencil, or ink for example, but life drawing really encourages you to use everything.
I really enjoyed charcoal and conté the most, they work really well together.
Ink and crayon are also an interesting duo, as they repel each other.