I am congenitally coordination-challenged to the extent that I was not able to learn to balance a bicycle until age 12 (after which I was hooked for life, having finally discovered one of the few sports I have truly, deeply loved). My hand-eye coordination, large muscle control, and sense of balance are well below average. As a consequence, I lack self-confidence in any activity which requires agility, so I don't attempt things like downhill skiing, surfing, unicycling, inline skating, or hands-free cycling. I tried using an eyeglass-mounted mirror in the 1970s, but quickly gave up. A few years ago I tried a helmet-mounted mirror, and now I hate to ride without it.