story: Sam decided he wanted to ride his bike to work to get some exercise. Sam didn't often ride his bike and had forgotten how to use the gears. Getting to work was simple since it was all down hill. Going home was difficult since the ride was all uphill. He arrived home exhausted and decided to practice gear-shifting.
 selected sentence: Sam decided he wanted to ride his bike to work to get some exercise.
Getting to work was simple since it was all downhill >Motivates> Sam wanted to ride his bike to work to get some exercise