I put the entire bike together with the help of my five year old and we were both pretty proud when it was all said and done ... until we realized that it require 4 D batteries to operate it! WHAT??? Exercise equipment run by batteries?!!? So now... ten days later... my 4D batteries are dead and its off to Amazon to order myself a power adapter. Here's to being back on my bike soon - cause I sure do love it when it's running (or should I say cycling)!!