An exceptionally physically fit person.
A participant in a group of sporting activities which includes track and field, road running, cross country running and racewalking.
A person who actively participates in physical sports, especially with great skill; a sportsperson.
She's the first athlete in her sport to obtain a corporate sponsor.
An acrobat.
One who, or that which, balances.
Any of the rear wings of certain insects used for stability in flight.