Answer:
Tomorrow's yesterday. Yesterday's tomorrow. What is it?
What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?
What can get you there in eco style, pushed by your legs mile after mile?
What starts with an "e" but only has a single letter in it?
What do we see every day, kings see rarely, and God never sees?
People take me on walks and I run and have fun. What am I?