Which sports have the biggest & smallest gap between pros and regular people?

Motorcycle racing, both on and off-road, is an insane leap. A good buddy won the overall in the Colorado Enduro Series (RMEC) and went to the nationals. He’s skilled and confident. His takeaway–“Dude, they passed me like I was standing still!” And, of course the penalty for fucking up racing motorcycles is pretty severe (especially road bikes).