Jessica, just do what you can. Every week you will see an improvement. Thinking back the first time I did P90X, I did the lean version and I maybe did 15% of the DVD. That was it. I kept pushing play every day. I would do thru the whole DVD doing what I could, altering where needed. Dang I even had to do push ups against the wall. NO WAY could I even do a pushup other wise. The warm ups alone kicked my butt. I couldn't do the jumping jacks without stopping to pee. It was a great journey. I finished the lean, the compleeted classic and started with doubles until life got way to busy. I am starting again in Jan!