How do I fit yoga in with a four year old?

I have got to do my Yoga 4 Fertility video today, but ds is using the VCR. I have the VHS version from the library, they don't have it on DVD.
I think I'll buy the DVD, unless there is a better one. I'd like one that has both short and long workouts. This one is about an hour or more, depending on whether you pause the tape.