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I used to ride around with no hands all the time, full length of the London's famous Hipster Highway. It builds skills. Skills which you will need when you're out for a ride on your old Raleigh that you got out of the shed, and the headset pinch bolt lets go and you have to get 4 miles home again with no way to keep straight, or steer round bends other than your finely-honed ability to ride no-handed.
Grown ups that ride around with no hands but there are levels.
1: just riding no hands unless your under 10 at a push 12 you look like a twat. Over 40 this is unforgivable.
2: riding around busy city centre roads or cycle lanes no hands your a dangerous twat.
3: as above but on mobile phone even worse if texting your a really dangerous twat this is when I start shouting.
4: yet to be seen but as above with the person riding no hands holding their phone like a slice of pizza and/or face timing. This is guaranteed to result in a accident because I'll be causing it by riding straight into them.