[InclinedPlane]

Being a physicist and being a surfer are not particularly correlated. As it turns out, being a physicist is rare, as is being a surfer, so finding a physicist surfer is unlikely, but that alone doesn't speak to the correlation of those skills.

Having a debilitating disease such as ALS is almost certainly much more strongly negatively correlated with being a physicist than is surfing, yet nobody would be silly enough (given the notable counter example) to say "people with ALS can't be physicists" as a blanket statement.