Thanks, Oakleaf, for the DVD recommendations! Will check them out.

As for headaches, I have also experienced brief headaches and lightheadedness towards the end of class and immediately afterwards, but they pass quickly. I was wondering if they were from the downward dog position since we do that frequently towards the end of the routine. I also have problems relaxing my neck when doing the ab work. It tends to want to take on the work my abs should be doing.