There is nothing more depressing than riding down a hill where you normally hit 25 mph just coasting, and having to pedal to maintain 12mph. On the flipside, I will always remember one windy spring day when I was around 10 years old. Our school had a sports field big enough for 6 soccer fields, plus a paved access road and parking lot. I had a Schwinn Sting-Ray (just like Kevin Arnold on the Wonder Years TV Show) with high-rise handle bars and a banana seat. My buddy had a Murray bike similarly equipped. We held the corners of our windbreakers in our hands on the handlebars, and with the wind at our backs rode "full-sail" over the field at what seemed to be highway speeds. We'd have to walk our bikes back to the start, but it was worth it to get a mighty push from the "hand of G-d".