My body hurts in places I didn't know I had muscles in.

I had my first session with my trainer today. He begins by telling me today will be an easy day. I want to make sure you come back the next time. I think telling me this was a mistake. By the end of the session I was sweating in places I didn't know you could sweat. My arms felt like jello and I could barely walk down the stairs. I do have to say I feel really good though. Yes I am sore and I feel weak, but my mood is really good and I feel like I am breathing better. Is that possible?

We did a lot of arms today which is good because I'd like to get them toned out as fast a possible. Once we are done he says " now comes the fun stuff." I can tell he's being sarcastic. He takes me over to were all the exercise balls are and grabs a small one. Sits it up against the wall and shows me exactly what he wants me to do. So like he showed me I put the ball against the wall and then against the small of my back and begin to squat. I do like 6 or 7 and as I am in the squatting position he says ok freeze. FREEZE are you kidding me! I'm in the sitting position, I am 80 lbs over weight and I already feel like I'm going to drop dead any second. But freeze is what I did until he told me I could begin squatting again. This went on over and over again for about 5 min. Man oh man was something so small so hard. All in all I think he's gonna be an awesome trainer. He is realistic and seems to know what he's doing. The best part came at the end. He says to me ok well we are done for today and we'll get you set up for next time. So I'm thinking at this point yes I can go home and relax until I go to work at 2. NOPE! He then proceeds to tell me " so once your done with our workouts I want you to get on a cardio machine and do 30 min, but your heart rates needs to stay between 155 and 160. CRAP! I don't know where I found the energy, but I did what he told me. I got on an eliptical and went for 30 min. Its took me 10 min just to hit 155 and every ounce of being in my body to stay there the other 20 min. I have a feeling I'm going to start seeing my weight drop off pretty quick. If not I'm good with it coming off slow as well :)