A man on a bike, with the sun beating down in the background, just launched off of a dirt ramp and is coming back down.
A professional bike rider performing tricks.
You can ride a bike off a ramp and not be a professional or performing tricks.
It is not assumed that the man on the bike is a professional, but it is assumed he is doing tricks because he launched off the dirt ramp.
A person can be on a bike without being a professional.