Trainer

A professional

• An animal trainer who trains animals for obedience, tricks and work.
• A horse trainer responsible for preparing a horse for races.
• A personal trainer who guides another person in developing physical fitness.
• An instructor in a business context.
• An athletic trainer who provides medical assistance to athletes or other physically active individuals.

Equipment

• A bicycle trainer device that attaches to a bicycle and makes it stationary for indoor training.
• A type of athletic shoe.
• An aircraft trainer used for training pilots.
• Trainer (games) – Games software for computer and video games that adds in extra options, usually to make the game easier.

Others

• Trainer, Pennsylvania, a borough in Pennsylvania, United States.
• Trainer (TV series), a British TV series.
• The river and municipality in Schleswig-Holstein in Germany is spelled Treene.