Just returned from my first workout: I haven't started with the OP routine like I wanted, the instructor in the gym made a list of exercises and helped me the entire time. I started with a 15 minute walk (I thought they were going to let me run for a bit, but when I asked they said that it wasn't necessary), then I had to do three sets of 15 standing leg curl, lat pull down (25-25-30 Kg), pectoral machine (30-30-35 Kg), triceps extensions and crunch.
Except for the last two, everything went just fine, the right arm is a bit more sore than the left one (I was having some troubles at the end of the triceps extensions). The guy said that I'm going to have to follow this routine for 4 weeks and then we'll go into squats and deadlifts.