Dang Teenagers!!!

So I have been going to the gym with my 14 yr old daughter. I want her to gain a knowledge and dare I say enjoyment, for working out and staying fit while it it just for regular maintenance and not for a consequence to gaining weight.
Anyway, this child of mine, who puts up a fight to clean her room, or wash dishes or basically anything that requires physical labor, goes in to tan for the first 5 min's while I get onto the treadmill and start walking. By the time she comes out, I am sweating and breathing heavy and already hearing the evil demon in my head telling me I could stop early, "only do 1/2 a mile", "you can walk slower", " You did walk around the house more than usual this morning, you don't NEED to do as much today at the gym"....You know the normal crap. So she gets onto the treadmill, puts her Ipod in and starts dancing on the treadmill!!! I could'nt roll my eyes far enough into the back of my head. Then, I am sure it was just to show me up, she starts the machine and immediatley starts RUNNING!!!!
Oh-em-gee! Who does this kid think she is? Flippin' Jackie Joyner-Kersee??? Oy-Vay. So she is running, smiling, still dancing and I can barely hold my pace walking. In the time it took me to walk my 1 mile, she ran her 2. She even started 15 minutes after me. When I reached the end, I unplugged, wiped off the handles and stepped down. She noticed and decided to stop hers as well. She then says to me, "Is that all your doing mom?"
Needless to say, I felt very discouraged. I was sweating like an old hairy fat man and she hadn't even broken a sweat. I felt that she was one more point of proof that I had let myself go and I have a very steep hill to climb to get into a healthy state of being. I know she is young and in better shape, but I want to be able to do everything she can do. It is so hard to see my kids run, jump, play....etc. I know I will get there. I have to be patient. I have to stop comparing myself to my beautiful, talented, spoiled daughter. I won't be able to do everything she can do. and that's ok. Then I remembered I CAN do something she can't. Drive home!