A common compromise is a flip flop hub. You can put it on one way, and it is fixed ( you must always pedal ), or put it on the other way, and you are single-speed. You can stop pedaling, but you still have the simplicity of a single speed bike; no gear changes, no nonsense.I am wondering if you have a fixed gear bike, and you stop pedaling, do the pedals keep moving and hit your feet or can they spin freely?
Easy, just whip your foot back to the tire and drag it. I could lock a tire up and skid a tire down to the tubes faster than you could say "Watch out your tire is gonna blow."How could you brake fast enough if you needed to when using your shoe?