how do I log my exercise?

melnmatt

I will be doing a class here at the gym in an hour and it is called cardio mix. Its a lil weights a lil zumba, a lil kickboxing and step. The class lasts an hour and its a really good class, only I am unsure how to log this and how many calories are burned. Any suggestions? I dont have any gadgets to record heart rate or anything.