I've been having some trouble getting into the yoga studio, but I want my practice to go forward, so I tried doing something I've done a couple of times before: a half session on my own. Basically I did one set of each pose as opposed to two. It took me about 40 minutes. I felt great when I was done.
It was lacking some, though. There was no heat (which actually was not all that great of a problem!). And no one was egging me along, so I had to concentrate harder on not giving up a pose when it got difficult.
But I think this may be a good way to keep things going when I can't get to the studio.
By the way, I found this amazing video of Kristina Kireeva that made me realize that I could go a lot further in the Cobra Pose (Bhujangasana).