P90X....its time to feel the pain!!!

I woke up this morning and decided today was going to be the day to start this work out routine.  I really need to tone up my midsection.  Well as I watch the video first before I start any of the exercise, I am like I can do this...piece of cake...NOT!!!! as soon as I get on the floor and start I start to feel the pain.  I am going very slow right now...but hopefully in time I will increase from 15 to the 25 reps I am supposed to be doing.  Boot Camp starts next week....so I got to get ready.