Bike Riding skills

Since Cami and Griffin learned to ride without training wheels and I got a new bike (Cami - "YOU can ride a bike?), we've been going on family bike rides around the neighborhood.  Griffin now rides like he was born to it, which is strange because he was the most resistant to learning how.  Cami, on the other hand, prefers to ride as short a distance as possible before stopping.  She has no desire to practice and build endurance.  I guess she figures she knows how to do it, and that is good enough.  Enjoy the video.