Core class - Friday 24/9

First time I've been to a core class and I took it easy since it's been a tiring week, I didn't know what to expect and I didn't want to overdo it.  Was a bit shocked when we had to do squats, though they were too bad - the floor work with the ball was much worse.  At the time it didn't seem too intense, but I was very tired afterwards (probably not helped by the fact I only arrived at uni 10 minutes before the class).  I can feel that my lower hack muscles are tired, and that'll probably get worse, but I plan to go to the class again