To exert means to use effort or energy to do something, like lifting weights at the gym. It's also a way of expressing an opinion or making someone feel a particular way.
When we talk about exerting ourselves, it usually means trying our best or putting in extra work. For example, if you're preparing for a marathon, you might need to exert yourself during training sessions to build up your endurance. But the word "exert" can also be used when talking about how someone feels or what they think others should do. If someone exerts pressure on you, it means they're making strong demands or requests.
To put in vigorous action.
Example: I exerted myself in today's training.
