There exist humans on a world with 35% the gravity of Earth and air five times denser. These people have invented wingsuits with extensions that go past their arms and enable them to fly by flapping their arms.
In the same way that certain body types make people better suited for particular sports (e.g. thin people with long legs tend to be good runners), what would the ideal body type be for someone who flies with a wingsuit?
I am looking for body proportions, physical size, musculature, etc. Examples are encouraged.