I never learned how to ride no-hands. My sense of balance and my coordination were never all that good, and I have a weird fear of being off-balance, so I tend to ride very conservatively. But I can turn around and look behind me while keeping both hands on the bars with no problems. I'd be lost without my bar-end mirror; after too many years riding motorcycles, the mirror habit is ingrained, but so is the shoulder-check habit.