Assertiveness training is a form of behavior therapy designed to help people stand up for themselves in a balanced way between passivity and aggression. It was introduced in the 1960s and involves learning honest and straightforward expression of thoughts and feelings in a socially appropriate manner. Assertiveness training uses exercises like role playing, exposure therapy, and cognitive techniques to help people overcome fears and develop confidence in expressing themselves and refusing unreasonable requests. Being assertive can benefit mental health and improve communication and problem solving.