My seven-year-old son Phoenix and I were about to ride down a big hill on Nantucket. We have one of those contraptions where he can ride on the back of my bike on his own little bike. We attach it to my bike and it becomes a bicycle built for two. I steer and we both pedal.
He was anticipating the big hill we were about to ride down toward Sankaty and said, "I'm excited! Sometimes you're excited and scared at the same time mommy."
I couldn't say it better myself.